US3837279A - Blasting cartridge and primer - Google Patents
Blasting cartridge and primer Download PDFInfo
- Publication number
- US3837279A US3837279A US00337934A US33793473A US3837279A US 3837279 A US3837279 A US 3837279A US 00337934 A US00337934 A US 00337934A US 33793473 A US33793473 A US 33793473A US 3837279 A US3837279 A US 3837279A
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- Prior art keywords
- package
- cylindrical member
- cartridge
- blasting
- section portion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/02—Blasting cartridges, i.e. case and explosive adapted to be united into assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/087—Flexible or deformable blasting cartridges, e.g. bags or hoses for slurries
Definitions
- CL 102/24 R both ends, or a full-length sheath, e.g., of water- [51] Int Cl. "F42b 3/02 resistant paper or plastic, which forms an end abut- [58] Field l' i 102/24 R ment surface at one or both of the package ends that impedes cartridge override and jamming during stringloading of boreholes.
- a primer comprising a blasting [56] SXF SZ cap embedded in this cartridge has the added advantage of improved integrity when punctured for the re- Duesing of the cap 3,200,743 8/l965 Griffith et al. 102/24 3,332,349 7/1967 Schwoyer et al. 102/24 20 Claims, 3 Drawlng Flgllres PAIENTEB FIG- FIG-
- the present invention relates to a blasting cartridge of water-bearing explosive especially adapted to be loaded efficiently in small-diameter boreholes.
- Water-bearing explosives which typically comprise an oxidizing component and a fuel component dispersed or dissolved in an aqueous medium that normally is thickened or gelled, currently are available in the form of small-diameter cartridges for use in underground blasting operations.
- the cartridge is a tube of plastic film, filled with explosive, and gathered at both ends and closed, e.g., by means of metal closure bands around the gathered portions.
- Such cartridges while performing very satisfactorily when properly loaded into the borehole, often are difficult to load by means of certain commonly used loading techniques.
- One efficient borehole loading technique is the string-loading technique whereby several cartridges are pushed into the hole, e.g., by means of a pole, at the same time in the form of a composite multi-cartridge unit or column.
- This technique is advantageous in that it is faster than a cartridge-by-cartridge loading procedure, and it avoids the possibility of cartridge column separation due to dust which can occur when the cartridges are loaded singly.
- the film-wrap, water-bearing explosive cartridges available in the art for use in underground blasting which generally range from about 7/8 inch to about 1 3/4 inches in diameter, cannot be loaded consistently in a trouble-free manner by the string-loading procedure.
- Cartridges of this type when pushed into the borehole as multi-cartridge units, i.e., units of two or more cartridges, tend to become wedged in the hole as a result of cartridge over-ride, especially in the case of rough-walled holes or when the borehole diameter exceeds the cartridge diameter, e.g., by one-quarter inch or more.
- the wedged mass of cartridges can produce a bridge in the cartridge column or a void at the back of the borehole, which can result in poor blasting performance, it is necessary to resort to a less efficient method of borehole loading, i.e., the movement of only one cartridge toward the back of the hole at a time.
- the currently available cartridges described above in practically acceptable film wrap thicknesses, also may afford problems related to lack of package integrity under certain handling conditions.
- the buckling and tear resistance of the cartridge may not be sufficient to withstand the poling force used during loading, especially when the borehole is rough and gravelly.
- puncturing a primer cartridge for insertion of a blasting cap may result in the propagation of the tear in the film and loss of the integrity of the cartridge.
- This invention provides an improved blasting cartridge of water-bearing explosive comprising (a) a tubular member made of pliable film material, e.g., a polymeric linear terephthalate ester, the tubular member i) being gathered and closed at both ends, e.g., by means of encircling closure means such as a metal band or clip, and (2) containing a water-bearing explosive in an amount sufficient to produce a tubular package having a substantially uniform cross-section portion and tapered end portions continuous therewith; and (b) at least one water-resistant hollow cylindrical member.
- a tubular member made of pliable film material e.g., a polymeric linear terephthalate ester
- the cylindrical member forming a circularly bounded end abutment surface, e.g., an annular surface, on the package, the abutment surface having an effective diameter at least about equal to that of the uniform cross-section portion of the package, and the stiffness of the cylindrical member and the position and attitude of the abutment surface relative to the tapered portion of the package being such that when said cartridge is positioned coaxially with its end abutment surface in contact with the end of another like cartridge, a compressive force applied axially to the pair of contacting cartridges causes cartridge lodgement against the end abutment surface, thereby impeding substantial relative motion of the cartridge.
- the invention also provides a primer comprising the blasting cartridge of the invention and a blasting cap embedded within the water-bearing explosive therein and disposed within a perforation in the film material located in the portion of the package around which the cylindrical member is circumferentially disposed or in the tapered end portion of the package to which the cylindrical member extends, the cylindrical member preferably being of sufficient length that the cap embedded in the explosive is located substantially totally within the confines of the cylindrical member.
- FIGS. 1 and 2 are longitudinal cross'sectional views of two different embodiments of the blasting cartridge of the invention.
- FIG. 3 is a longitudinal cross-sectional view of a primer of the invention.
- a waterbearing explosive composition is enclosed in a tubular film package which has a sheath or jacket, or one or more sleeves or capsules, fittedaround it and adapted to provide, at one or both ends of the package, an abutment surface against which an adjacent cartridge will become lodged during borehole loading so as to prevent cartridge override.
- the package wall is impermeable to seepage from within, and the cartridge has good dimensions] stability owing to the fact that tight packing of the explosive can be achieved with a film package gathered and mechanically closed at both ends.
- the cartridge of the invention has an end abutment surface, e.g., the annular surface of a projection or shelf formed by the end of a stiff sheath or sleeve, which surface is about as large in effective diameter as the uniform cross-section portion of the package, and this feature permits the cartridge to be string-loaded in a borehole without difficulty.
- the cartridge design also is more favorable with respect to resistance to tear propagation in a primer cartridge which is punctured for the reception of a blasting cap, and the preferred cartridge, wherein a single cylindrical member extends to both end portions of the package, additionally has the buckle and tear resistance needed to withstand high loading forces coupled with a high degree of borehole wall resistance.
- the tubular member from which the package is formed is filled, or nearly filled, with a water-bearing explosive, and the ends of the tubular member are constricted, or gathered, and closed, thereby forming a tubular package of substantially uniform circular crosssection between, and continuous with, tapered end portions.
- a package can be made, for example, using packaging machinery such as that described in US. Pat. No. 2,831,302, issued Apr. 22, 1958, to Oscar Mayer and Co.
- the tubular member and package are made of pliable film material, e.g., a polymeric linear terephthalate ester such as polyethylene terephthalate, polyethylene, cellophane, a vinyl polymer, etc.
- Polyethylene terephthalate film is preferred because of its resistance to creep, ease with which it can be intentionally slitted for tamping, etc.
- Polyethylene terephthalate should be in a biaxially oriented, heat-set form as described in US. Pat. No. 2,830,735, issued Jan. 21, 1958, to L. E. Amborski.
- the continuous longitudinal seam which is made in the advancing tube in the apparatus described in the aforementioned US. Pat. No. 2,831,302 can be made by the method described in co-pending, co-assigned US. Pat. Application Ser. No. 281,165, filed Aug. 16, 1972, by W. .1. Simmons.
- At least one hollow cylindrical member is circumferentially disposed around the package, the cylindrical member(s) being disposed around the uniform crosssection portion of the package and extending at least about as far as one, or preferably both, of the tapered end portions.
- the endmost portion of the cylindrical member forms a peripheral abutment surface on the end portion of the package, the abutment surface being a substantially circularly bounded surface having an effective diameter equal to at least about the diameter of the uniform cross-section portion of the package.
- the cylindrical member is a uniformdiameter tube having substantially flat annular end surfaces, and the abutment surface can be an annular end surface of such a cylindrical member, which surface lies in a plane that is substantially normal to the longitudinal axis of the tubular member.
- the abutment surface need not be flat or annular, however, as will be discussed hereinafter.
- the exact contour of the abutment surface and the position of this surface with respect to the adjoining package surface can vary, provided that the effective, i.e., outermost, diameter of the abutment surface is at least about equal to the diameter of the uniform cross-section portion of the package, i.e., larger than the diameter of the tapered portion of the package.
- the cylindrical member generally should extend to, and the abutment surface lie in, a plane which bounds, or falls outside the boundaries of, the uniform cross-section portion of the package, this plane being substantially normal to the longitudinal axis of the tubular member.
- the degree of rigidity or stiffness of the cylindrical member is sufficiently high that the effective diameter of the abutment surface does not become substantially reduced as a result of the abutment under an axially applied compressive force.
- FIG. 1 which shows a blasting cartridge of the invention wherein two separate sleeves are dis posed around the film package, one at each tapered end, a tubular package 1, filled with water-bearing explosive 2 and formed from a tubular member of pliable film having gathered ends 3 and 4, held closed by encircling closure members 5 and 6, respectively, has a substantially uniform circular cross-section portion 10 between, and continuous with, tapered end portions lb and 1c.
- cylindrical member 7 g., plastic, or waxed or plastic-coated paper tubes
- cylindrical member 7 extending to tapered portion 1b and cylindrical member 8 to tapered portion 1c.
- Abutment surfaces 7a and 8a are annular (i.e., circularly bounded) and substantially flat, and lie in planes that are substantially normal to the longitudinal axis of package 1.
- Cylindrical members 7 and 8 are of uniform diameter, and therefore the outer or peripheral (i.e., the effective) diameter of surfaces 70 and 8a equals the outer diameter of cylindrical members 7 and 8.
- the end portions of cylindrical members 7 and 8 of which abutment sufaces 7a and 8a are a part thus can be seen to form angular projections, or shelves, around the shoulder portions of package 1 where tapering begins, these projections serving as backstops against the passage of axially adjacent cartridges when an axial compressive force is applied to a column of the cartridges in a restricted passage such as a borehole.
- the portions of cylindrical member 9 which extend beyond the tapered portions 1b and 1c are collapsed so as to form accordian-pleated annuli 10 and 11, respectively, the end surfaces of cylindrical member 9 forming annular abutment surfaces 9a and 9b, which lie in the same planes as gathered ends 3 and 4, respectively.
- pleated annuli 10 and 11 form backstop end projections on package 1, tapered portions 1b and It being recessed within pleated annuli l0 and 11, respectively.
- the actual outer diameter of the abutment surfaces can be smaller than that of the uniform crosssection portion of the package, e.g., when the surfaces are in planes passing through trough portions of the pleated annuli, the effective diameter of the surface is intended to denote the diameter at the crest portions of the pleated annuli, such portions in effect acting as the abutment surfaces under compression.
- the primer shown in FIG. 3 also has a single hollow cylindrical member 9 disposed around package 1, extending beyond tapered portions lb and 10.
- the portions of cylindrical member 9 which extend beyond tapered portions 1b and 1c are uncollapsed, forming straight-walled annuli 12 and 13, respectively, which act as backstop end projections on package 1,
- Blasting cap 14 in this instance an electric blasting cap, is embedded in waterbearing explosive 2, the cap having been inserted through perforation in the film material in tapered portion lb.
- This primer is adapted for use in bringing about the detonation of other blasting cartridges in a cartridge column.
- the cylindrical member In order that a surface of the cylindrical member disposed around the film package be adapted to abut with an opposing surface of an adjacent package under an axial compressive force without over-ride, the cylindrical member generally should extend to the boundary plane between the uniform cross-section and tapered portions of the package (or to the shoulder of the package), as shown in FIG. 1, or beyond such plane, as shown in FIGS. 2 and 3. While the position of the cylindrical member shown in FIG.
- the cylindrical member is sufficiently stiff and the contour of the abutment surface does not conform to the contour of the tapered portions of the package (i.e., the abutment surface preferably forms an angle of at least about 90 with the wall of the uniform cross-section portion of the package), it may be desirable, e.g., for reasons associated with the capabilities of available cartridging machinery, or to provide maximum capability with respect to abutment strength and cartridge integrity, to extend the cylindrical member(s) to locations beyond the boundary planes specified above.
- the distance between the abutment surface and a plane parallel thereto tangent, to the nearest surface of the package is not critical, it is preferred that the distance between the abutment surface and a plane parallel thereto tangent, to the nearest surface of the package (normal to the packages longitudinal axis) be limited to assure propagation of detonation from one cartridge to the next in a column of cartridges.
- the maximum distance between the abutment surface and the aforementioned parallel plane depends on the gap sensitiveness of the blasting agent, desired borehole loading density, etc., but generally will be about l-3 inches.
- One way to reduce this distance is to collapse the extended portion of the cylindrical member, e.g., to form an accordionpleated annulus such as is shown in FIG. 2, or to peripherally fold the end of the cylindrical member thereby producing, in some cases, a substantially closed end over the gathered portion of the tubular member.
- the accordion-pleated annulus is preferred over the closedend modification.
- the end abutment surface is internal as well as peripheral, the entire closed end surface being the abutment surface in this case.
- Collapsing of the extended portion(s) of the cylindrical member can be effected in situ, e.g., by using cartridges with uncollapsed extended end portions and crushing the end portions by axial force while loading the cartridges in the borehole, but it is preferred that cartridges having pre-collapsed extended end portions be employed so as to assure that propagation requirements are met.
- the abutment surface of the package is the same as the end surface of the cylindrical member; in other cases, e.g., those in which a circumferential fold is made in the extended end portion of the cylindrical member, the abutment surface is a portion of the side surface of the cylindrical member.
- abutment surface is one which is substantially flat, and lies in a plane substantially normal to the longitudinal axis of the package.
- the blasting cartridge of the invention can have a single cylindrical member disposed around the film package extending to only one end thereof, e.g., an endsleeve (open at both ends, or closed at the outermost end in the form of a capsule), such cartridges being capable of being satisfactorily string-loaded in boreholes with the sleeved end of one cartridge abutting the unsleeved end of the adjacent cartridge, etc.
- a single abutment surface for each pair of adjacent cartridges, and the unsleeved end of one of the cartridges lodges against the abutment surface of the other.
- the cylindrical member(s) are stationarily engaged with the film package, e. g., by friction fit, a layer of adhesive, etc. This assures that the required position of the abutment surface(s) provided by the cylindrical member(s) is maintained during handling and loading into a borehole.
- An effective means of obtaining the stationary engagement between the package and the cylindrical member(s) is to use a cylindrical member having a slightly smaller inner diameter than the outer diameter of the uniform cross-section portion of the water-bearing explosive package, e.g., about l/32 of an inch smaller.
- the dimensions of the cylindrical member(s) will be selected on the basis of economics, conditions the cartridge is expected to withstand, etc. If one or two end sleeves are used, their length should be at least about equal to, and preferably at least about 1.2 times, the diameter of the uniform cross-section portion of the package.
- the sleeve at the blasting cap end of the cartridge preferably is long enough that the cap embedded in the explosive is located essentially completely within the confines of the sleeve. This design affords better stability with respect to the cap position in the cartridge, reducing the possibility of the caps exiting from the side wall of the cartridge.
- a single end-to-end sheath is employed, its length is at least about equal to the distance between the planes bounding the uniform cross-section portion of the film package, and not so great that the distance between each abutment surface and a plane parallel thereto tangent to the nearest surface of the package (normal to the packages longitudinal axis) causes the gap sensitiveness of the explosive to be exceeded, as discussed above.
- the material of construction and thickness of the cylindrical member are such that the member is strong enough to provide and maintain the required abutment surface for an adjacent cartridge to lodge against when the cartridges are subjected to axial compressive force, as in string-loading of boreholes.
- the cylindrical member must possess a certain degree of stiffness or rigidity, while at the same time not being brittle or easily shatterable, a condition which could lead to failure of the member during handling or use of the cartridge.
- the cylindrical member should possess sufficient wet-strength that it does not become weakened when subjected to humid storage or wet boreholes to the extent that the abutment surface cannot be maintained.
- Certain natural papers are suitable materials of construction, e.g., manila and kraft papers, paperboard such as cardboard, etc., suitably treated or coated, where required, to achieve the necessary wetstrength, e.g., coated with a wax or plastic such as polyethylene.
- Synthetic paper-like sheet materials e.g., spunbonded olefins, such as high-density polyethylene, and molded or extruded plastics are the best material of construction on the basis of wet-strength, although strong, suitably coated or treated natural papers, e.g., waxed wet-strength kraft paper, may be preferred for economy reasons.
- the wall thickness of the cylindrical member will depend on the available thicknesses for the material used and the severity of use conditions, sleeves and sheaths usually being at least about 0.005 inch thick. Paper cylindrical members can be convolute-wound or spiral-wound, both types being equally effective.
- the particular water-bearing explosive composition contained in the blasting cartridge is not critical, and can be any desired composition. Because the cartridge can be string-loaded satisfactorily, i.e., moved into a borehole as a multi-cartridge unit, and can be subjected to stemming procedures without breakage, the cartridge is especially suitable for use in underground blasting in coal, and accordingly the explosive composition in cartridges intended for this use will be a permissible explosive, e.g., a formulation of the type described in US. Pat. 3,43 1,155, issued Mar. 4, 1969, to C. Dunglinson and W. M. Lyerly.
- the primer of the invention has a blasting cap embedded within the water-bearing explosive therein and disposed within a perforation in the film material, the perforation being located either in a tapered end portion of the package to which the cylindrical member extends, as shown in FIG. 3, or in the side wall of the package around which the cylindrical member is circumferentially disposed (a perforation also being made in the cylindrical member wall in this case).
- a perforation also being made in the cylindrical member wall in this case.
- the attitude of the blasting cap in the cartridge is not critical especially since the cylindrical member, in the preferred primer, is long enough that the embedded cap is located essentially completely within the confines of the cylindrical member; thus a cap which is not parallel to the longitudinal axis of the tubular package is prevented by the cylindrical member from exiting from the side wall of the film package.
- the specific blasting cap employed (type, design, and size) is dependent on the waterbearing explosive composition used and whether an electrical or non-electrical initiation system is desired. Any standard electric or non-electric blasting cap can be employed.
- Example 1 Twelve-inch-long tubular packages made from a tubular member of biaxially oriented, heat-set polyethylene terephthalate film, 0.0015-inch thick, gathered and closed at each end with a metal clip, contain a waterbearing explosive composition of the class described in the aforementioned US. Pat. No. 3,431,155, the sensitizer component of the composition comprising monomethylamine nitrate.
- the packages have a 1.25-inchdiameter uniform circular cross-section portion continuous with tapered end portions.
- a 1.50-inch long spiral-wound kraft paper sleeve having a 1.25-inch outer diameter and a 0.0l6-inch wall thickness is positioned on each end of six of the above-described packages, the endmost surface of each sleeve being located at the shoulder portion of the package where tapering begins.
- the tapered end portion of one of the cartridges is punctured and a dummy electric blasting cap is inserted into the cartridge through the puncture.
- the latter (primer) cartridge retains its integrity after insertion of the dummy cap, the puncture failing to propagate beyond the sleeve.
- the six cartridges are positioned, primer cartridge first, in end-to-end abutting relationship in a simulated borehole, tce latter being a 1.875-inch inner diameter transparent plastic tube, l0-feet long and containing about a quart of wet sand and gravel distributed along its length, the tube being tilted about 3 below horizontal. Then the column of six cartridges is shoved as a unit toward the back of the hole (end of the tube). The column advances through the tube without cartridge override and jamming, even though considerable resistance to the columns movement is presented by the build-up of gravel ahead of the column.
- Example 2 Similar results to those described in Example 1 are obtained when the procedure described in Example 1 is repeated with the exception that the paper sleeve is positioned on only one end of each package, the primer cartridge having the sleeve positioned at the end at which the blasting cap is inserted. The six cartridges are positioned in the simulated borehole with the sleeved end of one cartridge abutting the unsleeved end of the adjacent cartridge, etc.
- Example 3 The procedure described in Example 1 is repeated with the exception that the sleeves are made of polyethylene and have a 0.030-inch wall thickness. The results are similar to those obtained in Example 1.
- Example 4 A full-length sheath of waxed wet-strength kraft paper lb. basis weight plus 15 lb. wax, based on a 3,000 sq. ft. area) is formed and secured around the tubular packages described in Example 1 by wrapping a 12-inch by 4.75-inch sheet of the paper around the package, and applying adhesive between the wrapper and the polyethylene terephthalate film, and also to the wrapper overlap.
- the end surfaces of the sheath lie in planes which are tangent to the tapered portions of the package normal to the longitudinal axis.
- Cartridges having the described full-length sheath are string-loaded in the simulated borehole in columns of nine cartridges without difficulty due to override.
- Example 5 Similar results to those obtained in Example 4 are obtained when the waxed paper sheath described in Example 4 is replaced by a sheath of 68 pound (per 3,000 sq. ft.) manila paper having a coating of 1.5 mils polyethylene on each side.
- Example 6 The cartridges described in Example 4, having a diameter of the uniform cross-section portion of one inch in this case, are string-loaded in 6-7 cartridge columns in 1 7/32 inch diameter, 8.5-9 inch deep boreholes in a limestone formation. Each column of cartridges is pushed to the back of the hole with a l-inch-diameter pole.
- the primer cartridge in each hole contains an electric delay blasting cap. No wedging of cartridges occurs on loading. After completion of the blasting circuit, the round is fired. Satisfactory breakage is achieved, indicating that the holes had been properly loaded.
- a blasting cartridge comprising a. a tubular member made of pliable film material,
- tubular member being gathered and mechanically closed at both ends and containing a waterbearing explosive in an amount sufficient to produce a tubular package having a substantially uniform circular cross-section portion and tapered end portions continuous therewith;
- a blasting cartridge of claim 1 wherein two separate cylindrical members are circumferentially disposed around said tubular member, each cylindrical member extending at least about as far as the plane nearest thereto which bounds the uniform cross-section portion of said package.
- a blasting cartridge of claim 1 wherein said abutment surfaces are annular end surfaces of said cylindrical member(s).
- a blasting cartridge of claim 6 wherein the portions of said cylindrical member(s) which extend beyond said tapered portions are collapsed so as to form said abutment surfaces.
- a blasting cartridge of claim 1 wherein said film material comprises a polymeric linear terephthalate ester.
- a blasting cartridge comprising a. a tubular member made of pliable film material
- said member being gathered and mechanically closed at both ends and containing a water-bearing explosive in an amount sufficient to produce a tubular package having a substantially uniform circular cross-section portion and tapered end portions continuous therewith;
- a water-resistant hollow cylindrical member circumferentially disposed around, and stationarily engaged with, said package at the uniform crosssection portion thereof and extending at least about as far as both of the planes which bound said uniform cross-section portion and are substantially normal to the longitudinal axis of said tubular member, said cylindrical member forming two circularly bounded end abutment surfaces on said package, said abutment surfaces having an effective diameter at least about equal to that of the uniform cross-section portion of said package, and the stiffness of said cylindrical member and the position and attitude of said abutment surfaces relative to said tapered portions of said package being such that when said cartridge is positioned coaxially with one of its end abutment surfaces in contact with an end abutment surface of another like cartridge, a compressive force applied axially to the pair of contacting cartridges causes each cartridge to lodge against the others end abutment surface, thereby impeding the relative motion of the cartridges.
- a blasting cartridge of claim 14 wherein the portions of said cylindrical member which extend beyond said tapered portions are collapsed so as to form said abutment surfaces.
- An explosive primer comprising a. a tubular member made of pliable film material
- tubular member being gathered and mechanically closed at both ends and containing a waterbearing explosive in an amount sufficient to produce a tubular package having a substantially uniform circular cross-section portion and tapered 15 end portions continuous therewith;
- a blasting cap embedded within the water-bearing explosive in said package and disposed within a perforation in the film material located in the portion of said package around which said cylindrical member(s) are circumferentially disposed or in the tapered end portions of said package to which said cylindrical member(s) extend.
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Abstract
Description
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US00337934A US3837279A (en) | 1973-03-05 | 1973-03-05 | Blasting cartridge and primer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US00337934A US3837279A (en) | 1973-03-05 | 1973-03-05 | Blasting cartridge and primer |
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US3837279A true US3837279A (en) | 1974-09-24 |
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US00337934A Expired - Lifetime US3837279A (en) | 1973-03-05 | 1973-03-05 | Blasting cartridge and primer |
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Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51106708A (en) * | 1975-03-15 | 1976-09-21 | Nippon Koki Kk | SATSUKOHENOBAKUYAKUHONO SOTENHOHO |
JPS51110012A (en) * | 1975-03-24 | 1976-09-29 | Du Pont | Bakuhayakuho oyobi raikantsukibakuhayakuho |
JPS5256081U (en) * | 1975-10-20 | 1977-04-22 | ||
JPS5262384U (en) * | 1975-10-30 | 1977-05-09 | ||
US4023494A (en) * | 1975-11-03 | 1977-05-17 | Tyler Holding Company | Explosive container |
US4036138A (en) * | 1974-11-08 | 1977-07-19 | Indian Explosives Limited | Rigid waterproof container for slurried explosives in small diameters |
US4052939A (en) * | 1976-04-01 | 1977-10-11 | E. I. Du Pont De Nemours And Company | Tampable chub cartridge |
US4369711A (en) * | 1980-11-24 | 1983-01-25 | Harold Leader | Bag for explosives with lower reinforcing sleeves |
US4493260A (en) * | 1983-11-08 | 1985-01-15 | The United States Of America As Represented By The Secretary Of The Navy | Annular shaped charge for breaching masonary walls |
US4537133A (en) * | 1983-03-31 | 1985-08-27 | The United States Of America As Represented By The Secretary Of The Interior | Non-incendive rock-breaking explosive charge |
US4872408A (en) * | 1987-03-25 | 1989-10-10 | C-I-L Inc. | Polymeric film-enveloped explosive cartridges and their manufacture and use |
US5497829A (en) * | 1993-11-17 | 1996-03-12 | Foam Concepts, Inc. | Expansion foam borehole plug and method |
EP0717259A1 (en) * | 1994-12-14 | 1996-06-19 | Altech Industries (Pty) Limited | Detonators |
US6817298B1 (en) * | 2000-04-04 | 2004-11-16 | Geotec Inc. | Solid propellant gas generator with adjustable pressure pulse for well optimization |
US20060272684A1 (en) * | 2005-06-01 | 2006-12-07 | Steur Frans Jr | Method of and apparatus for cleaning fouling in heat exchangers, waste-heat boilers and combustion chamgers |
US20070196602A1 (en) * | 2006-02-17 | 2007-08-23 | Sonoco Development, Inc. | Water-resistant wound paperboard tube |
US8826821B2 (en) | 2009-08-21 | 2014-09-09 | Crinum Ip Pty Ltd | Explosives container and method |
WO2019070110A1 (en) * | 2017-10-03 | 2019-04-11 | Fabriser, S.A. De C.V. | Anti-static, folding container for blasting operations, which can be partially compressed, and associated accessories |
US11193740B2 (en) * | 2019-03-08 | 2021-12-07 | Dyno Nobel Inc. | Axially-centered external detonating cord packaged product |
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US2754756A (en) * | 1951-02-26 | 1956-07-17 | Bert F Duesing | Detonator holder |
US3200743A (en) * | 1963-10-24 | 1965-08-17 | Trojan Powder Co | Waterproof package for explosives |
US3332349A (en) * | 1965-08-16 | 1967-07-25 | Trojan Powder Co | Presplitting blasting assembly |
CA794623A (en) * | 1968-09-17 | R. Phare George | Explosive cartridge |
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CA794623A (en) * | 1968-09-17 | R. Phare George | Explosive cartridge | |
US2754756A (en) * | 1951-02-26 | 1956-07-17 | Bert F Duesing | Detonator holder |
US3200743A (en) * | 1963-10-24 | 1965-08-17 | Trojan Powder Co | Waterproof package for explosives |
US3332349A (en) * | 1965-08-16 | 1967-07-25 | Trojan Powder Co | Presplitting blasting assembly |
Cited By (25)
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US4036138A (en) * | 1974-11-08 | 1977-07-19 | Indian Explosives Limited | Rigid waterproof container for slurried explosives in small diameters |
JPS51106708A (en) * | 1975-03-15 | 1976-09-21 | Nippon Koki Kk | SATSUKOHENOBAKUYAKUHONO SOTENHOHO |
JPS51110012A (en) * | 1975-03-24 | 1976-09-29 | Du Pont | Bakuhayakuho oyobi raikantsukibakuhayakuho |
JPS5256081U (en) * | 1975-10-20 | 1977-04-22 | ||
JPS5354541Y2 (en) * | 1975-10-20 | 1978-12-27 | ||
JPS5262384U (en) * | 1975-10-30 | 1977-05-09 | ||
US4023494A (en) * | 1975-11-03 | 1977-05-17 | Tyler Holding Company | Explosive container |
US4052939A (en) * | 1976-04-01 | 1977-10-11 | E. I. Du Pont De Nemours And Company | Tampable chub cartridge |
US4369711A (en) * | 1980-11-24 | 1983-01-25 | Harold Leader | Bag for explosives with lower reinforcing sleeves |
US4537133A (en) * | 1983-03-31 | 1985-08-27 | The United States Of America As Represented By The Secretary Of The Interior | Non-incendive rock-breaking explosive charge |
US4493260A (en) * | 1983-11-08 | 1985-01-15 | The United States Of America As Represented By The Secretary Of The Navy | Annular shaped charge for breaching masonary walls |
US4872408A (en) * | 1987-03-25 | 1989-10-10 | C-I-L Inc. | Polymeric film-enveloped explosive cartridges and their manufacture and use |
US5497829A (en) * | 1993-11-17 | 1996-03-12 | Foam Concepts, Inc. | Expansion foam borehole plug and method |
US5803172A (en) * | 1993-11-17 | 1998-09-08 | Foam Concepts, Inc. | Mine shaft and adit closure apparatus and method |
EP0717259A1 (en) * | 1994-12-14 | 1996-06-19 | Altech Industries (Pty) Limited | Detonators |
US6817298B1 (en) * | 2000-04-04 | 2004-11-16 | Geotec Inc. | Solid propellant gas generator with adjustable pressure pulse for well optimization |
US20060272684A1 (en) * | 2005-06-01 | 2006-12-07 | Steur Frans Jr | Method of and apparatus for cleaning fouling in heat exchangers, waste-heat boilers and combustion chamgers |
US20110114035A1 (en) * | 2005-06-01 | 2011-05-19 | Steur Jr Frans | Method of and apparatus for cleaning fouling in heat exchangers, waste-heat boilers and combustion chambers |
US7959432B2 (en) * | 2005-06-01 | 2011-06-14 | Frans Steur, Senior | Method of and apparatus for cleaning fouling in heat exchangers, waste-heat boilers and combustion chambers |
US20070196602A1 (en) * | 2006-02-17 | 2007-08-23 | Sonoco Development, Inc. | Water-resistant wound paperboard tube |
US7842362B2 (en) | 2006-02-17 | 2010-11-30 | Sonoco Development, Inc. | Water-resistant wound paperboard tube |
US8826821B2 (en) | 2009-08-21 | 2014-09-09 | Crinum Ip Pty Ltd | Explosives container and method |
WO2019070110A1 (en) * | 2017-10-03 | 2019-04-11 | Fabriser, S.A. De C.V. | Anti-static, folding container for blasting operations, which can be partially compressed, and associated accessories |
US11236974B2 (en) | 2017-10-03 | 2022-02-01 | Fabriser, S.A. De C.V. | Anti-static, folding container for blasting operations, which can be partially compressed, and associated accessories |
US11193740B2 (en) * | 2019-03-08 | 2021-12-07 | Dyno Nobel Inc. | Axially-centered external detonating cord packaged product |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ETI EXPLOSIVES TECHNOLOGIES INTERNATIONAL INC., RO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:E.I. DU PONT DE NEMOURS AND COMPANY;REEL/FRAME:004834/0446 Effective date: 19880118 Owner name: ETI EXPLOSIVES TECHNOLOGIES INTE,STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:E.I. DU PONT DE NEMOURS AND COMPANY;REEL/FRAME:004834/0446 Effective date: 19880118 |
|
AS | Assignment |
Owner name: TORONTO DOMINION BANK Free format text: SECURITY INTEREST;ASSIGNOR:ETI EXPLOSIVES TECHNOLOGIES INTERNATIONAL INC.;REEL/FRAME:004829/0868 Effective date: 19871231 Owner name: TORONTO DOMINION BANK,STATELESS Free format text: SECURITY INTEREST;ASSIGNOR:ETI EXPLOSIVES TECHNOLOGIES INTERNATIONAL INC.;REEL/FRAME:004829/0868 Effective date: 19871231 |