CA1046812A - Delay blasting assembly - Google Patents
Delay blasting assemblyInfo
- Publication number
- CA1046812A CA1046812A CA256,213A CA256213A CA1046812A CA 1046812 A CA1046812 A CA 1046812A CA 256213 A CA256213 A CA 256213A CA 1046812 A CA1046812 A CA 1046812A
- Authority
- CA
- Canada
- Prior art keywords
- low energy
- delay
- cord
- closure plug
- shock wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- F42B3/10—Initiators therefor
-
- 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
- F42B3/10—Initiators therefor
- F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
Abstract
ABSTRACT OF THE DISCLOSURE
The invention provide for a non-electric delay period blasting assembly which may be easily connected to a length of low energy initiating cord in the field.
The assembly comprises a delay period cap having a special moisture-proof closure which accommodate the energy trans-mitting end of an initiation cord.
The invention provide for a non-electric delay period blasting assembly which may be easily connected to a length of low energy initiating cord in the field.
The assembly comprises a delay period cap having a special moisture-proof closure which accommodate the energy trans-mitting end of an initiation cord.
Description
`- 1046812 This invention relates to the art of blasting with explosives and, particularly, to a non-electric delay blasting assembly for use with low energy detonating cord and low energy shock wave conductor tubing.
The use of non-electric delay period blasting caps initiated by means of low energy detonating cord as replace-ment for electric caps and conductive wire initiation, is now widely used in blasting operations wherever hazards may be present due to stray electric currents. Such a non-electric delay blasting system is disclosed, for example, in British Patent No. 858,794. A suitable type of delay blasting cap for u~e in a non-electric system is disclosed, for example, in Canadian Patent ~o. 627,435. More recently, a novel type of low energy detonating tube, suitable for use in non-electric blasting systems and sold under the name "NONEL" (Reg. Trademark), has been disclosed in Canadian Patent No. 878,056. Such a detonating tube, because of its construction and function, may more appropriately be called a low energy shock wave conductor.
For purposes of the present description, low energy detonating cord and low energy shock conductor will be jointly referred to as low energy initiating cord.
To achieve the optimum effect from delay blasting techniques, which techniques are well known in the art, using either electric or non-electric systems, it has been necessary to provide blasting caps having a range of delay periods, usually from O to about 10 seconds. In the manufacture of non-electric delay blasting caps, for example, a range in delay pe-riods is achieved by varying the length of the delay element within the detonator cap assembly. In addition and for the convenience of the user, the explosive industry now provides -` ~046812 a factory assembly comprising a non-electric delay cap having a length of low energy initiating cord permanently attached thereto. Also, because of the demands of the user and to accommodatevarious borehole depths, a variety of lengths of low energy initiating cords are provided for each delay period of cap, which lengths may vary from a few inches to several hundred feet. Thus the industry now provides a wide range of non-electric delay period caps and for each cap period, a range of lengths of attached initia-tors or cords. These requirements have imposed difficul-ties in production planning and control for the manufacturer and in inventory maintenance for both the manufacturer and the user since it is not always possible to accurately fore-cast the requirements of cap period/cord length combinations.
The present invention provides a non-electric delay blasting assembly which may be conveniently and safely connected to a low energy initiating cord in the field and thus overcomes the aforementioned difficulties.
According to the present invention a non-electric delay blasting aqsembly initiated by means of low energy initiating cord is provided which comprises in combination a cup-shaped metallic shell open at one end and in sequence from the bottom and within the said shell at least one explo-sive charge, a delay train, and a resilient closure plug, the said resilient closure plug comprising a cylindrical body having a central channel therethrough divided into two cylindri-cal compartments by means of an integral rupturable diaphragm thereacross, one of said comFartments being in contact with said delay train, and the second of said compartments being adapted to receive therein in gripping relationship the ~0468~2 ~energy transmitting end of a low energy initiating cord.
The invention i9 ~urther illustrated with reference to the accompanying drawing in which Fig. 1 shows a longi-tudinal sectional view of the detonator or cap unit of the invention and Figs. 2 and 3 show in sectional views lcw energy initiator cords having different terminal end embodiments.
Referring to Fig. 1 there is shown a cylindrical metal tube or shell 1 closed at one end and containing within and in sequence from the closed end a pressed explosive charge 2,a priming charge 3, a delay train comprising delay element 4 containing a delay composition 5 and a sealing element 6 containing a burning composition 7. Plastic top closure plug 8 contains a channel 9 therethrough. Channel 9 is divided into compartments 10 and 11 by means o-f rupturable integral plastic diaphragm 12. Diaphragm 12 serves to protect the internal burning elements against ingress of water. The upper open end of chamber 10 of plug 8 is charaterized by an area of reduced circumference generally comprising a rim 13, which rim provides a gripping or retaining surface against the end of an inserted length of low energy initiating cord 14 shown in dotted line.
Referring to Fig. 2 there is shown a length of shock wave conductor initiating tube 20 of the type marketed ~ under the name '~QNEL" (Reg. Trademark). Crimped at the end of cord 20 is a mini-detonator 21. Mini-de~onator 21 comprises a thin-walled metal tube closed at one end and containing a pressed charge of a primary explosive 22, for example, lead azide in an amount of about O.S grains or less. Mini-detonator 21 is fixed to cord 20 by means of circular crimp 23 --- 10~681Z
and is adapted for snap-it insertion into chamber 10 of plug 8 (Fig. 1). Upon insertion, the recess of crimp 23 is engaged and held by rim 13. The use of mini-detonator 21 provides a convenient means of transmitting low energy from cord 20, gives water proofness to cord 20, and provides a convenient snap-fit means of coupling cord 20 to plug 8.
Referring to Fig. 3, there is shown a length of conventional low energy detonating cord (LEDC) 30 of the type marketed under the name "ANOLINE" (Reg. Trademark).
Because of the available energy of LEDC, no attached mini-detonator is required to initiate the attached delay assembly. At the end of cord 30 is shown a tight-fitting water-proofing end cap 31 of, for example, a resilient plastic material such as polyethylene. End cap 31 comprises a closed end wall 32 which is easily ruptured upon the detonation of cord 30. End cap 31 also comprises a circular recessed area 33 adapted for snap-fit engagement with rim 13 of plug 8 (Fig. 1). Cap 31 may be additionally held on the end of cord 30 by means of an adhesive.
Initiating units comprising, for example, the type shown in Fig. 2, may be factory-assembled and sold in varying lengths of cord 20. Similarly, the delay unit of Fig. 1 may be provided in a wide range of delay periods. In the field, the blaster need only select his choice of delay detonator and simply couple it with an initiating cord of appropriate length to provide a desired combination for the work under-taken. He thereafter places the delay assembly in contact w ith the explosive to be detonated and initiates the low energy cord or shock wave conductor in a known manner.
The quantity of primary explosive utilized in mini-detonator 21 must necessarily be sufficient so that upon detonation, diaphragm 12 of plug 8 will be ruptured and powder core 7 of element 6 ignited. While about 0.5 grains of lead azide has been found to be a suitable charge for the mini-detonator, in many cases lesser amounts of primary explo-sive may be employed. Similarly the thickness of the end wall 32 of water-proofing cap 31 used with low energy detonating cord (LEDC) will be chosen so that both the cap end 32 and diaphragm 12 of plug 8 will be ruptured upon detonation of 0 LEDC 30 and powder core 7 ignited.
EXAMPLE
A lot of 15 mini-detonators were manufacture from aluminium CUp9 having dimensions of 0.125 inch inside diameter, 0.137 inch outside diameter and 0.735 inch in depth. A charge of 0.5 grain of lead azide was pressed into the base of each cup at a pressure of 50 psig. Each mini-detonator was attache~
to a length of "NONEL" shock wave conductor by means of a circular crimp as shown at 23 in Fig. ~ of the drawing. m e mini-detonator/shock wave conductorassembly was then inserted into chamber 10 of a non-electric detonator as shown in Fig. 1 of the drawing with the closed end of the mini-detonator close to diaphragm 12. Each shock wave conductor was then initiated by known means and in 15 of 15 tests the delay detonator was exploded in the expected time-delay interval. The detonation of the mini-detonator was sufficiently forceful to rupture diaphragm 12 and ignite powder train 7 without causing mal-function of the delay train and explosive charge within shell 1.
It will be obvious to those skilled in the art that the quantity of explosive charge 22 in mini-detonator 21 will necessarily have to be limited so that operation of the delay ~ ~etonator is achieved without premature destruction or damage thereof.
The invention thus provides a non-electric delay blasting assembly which may be easily and safely assembled in the field to provide a wide range of combinations of delay periods and initiator lengths.
The use of non-electric delay period blasting caps initiated by means of low energy detonating cord as replace-ment for electric caps and conductive wire initiation, is now widely used in blasting operations wherever hazards may be present due to stray electric currents. Such a non-electric delay blasting system is disclosed, for example, in British Patent No. 858,794. A suitable type of delay blasting cap for u~e in a non-electric system is disclosed, for example, in Canadian Patent ~o. 627,435. More recently, a novel type of low energy detonating tube, suitable for use in non-electric blasting systems and sold under the name "NONEL" (Reg. Trademark), has been disclosed in Canadian Patent No. 878,056. Such a detonating tube, because of its construction and function, may more appropriately be called a low energy shock wave conductor.
For purposes of the present description, low energy detonating cord and low energy shock conductor will be jointly referred to as low energy initiating cord.
To achieve the optimum effect from delay blasting techniques, which techniques are well known in the art, using either electric or non-electric systems, it has been necessary to provide blasting caps having a range of delay periods, usually from O to about 10 seconds. In the manufacture of non-electric delay blasting caps, for example, a range in delay pe-riods is achieved by varying the length of the delay element within the detonator cap assembly. In addition and for the convenience of the user, the explosive industry now provides -` ~046812 a factory assembly comprising a non-electric delay cap having a length of low energy initiating cord permanently attached thereto. Also, because of the demands of the user and to accommodatevarious borehole depths, a variety of lengths of low energy initiating cords are provided for each delay period of cap, which lengths may vary from a few inches to several hundred feet. Thus the industry now provides a wide range of non-electric delay period caps and for each cap period, a range of lengths of attached initia-tors or cords. These requirements have imposed difficul-ties in production planning and control for the manufacturer and in inventory maintenance for both the manufacturer and the user since it is not always possible to accurately fore-cast the requirements of cap period/cord length combinations.
The present invention provides a non-electric delay blasting assembly which may be conveniently and safely connected to a low energy initiating cord in the field and thus overcomes the aforementioned difficulties.
According to the present invention a non-electric delay blasting aqsembly initiated by means of low energy initiating cord is provided which comprises in combination a cup-shaped metallic shell open at one end and in sequence from the bottom and within the said shell at least one explo-sive charge, a delay train, and a resilient closure plug, the said resilient closure plug comprising a cylindrical body having a central channel therethrough divided into two cylindri-cal compartments by means of an integral rupturable diaphragm thereacross, one of said comFartments being in contact with said delay train, and the second of said compartments being adapted to receive therein in gripping relationship the ~0468~2 ~energy transmitting end of a low energy initiating cord.
The invention i9 ~urther illustrated with reference to the accompanying drawing in which Fig. 1 shows a longi-tudinal sectional view of the detonator or cap unit of the invention and Figs. 2 and 3 show in sectional views lcw energy initiator cords having different terminal end embodiments.
Referring to Fig. 1 there is shown a cylindrical metal tube or shell 1 closed at one end and containing within and in sequence from the closed end a pressed explosive charge 2,a priming charge 3, a delay train comprising delay element 4 containing a delay composition 5 and a sealing element 6 containing a burning composition 7. Plastic top closure plug 8 contains a channel 9 therethrough. Channel 9 is divided into compartments 10 and 11 by means o-f rupturable integral plastic diaphragm 12. Diaphragm 12 serves to protect the internal burning elements against ingress of water. The upper open end of chamber 10 of plug 8 is charaterized by an area of reduced circumference generally comprising a rim 13, which rim provides a gripping or retaining surface against the end of an inserted length of low energy initiating cord 14 shown in dotted line.
Referring to Fig. 2 there is shown a length of shock wave conductor initiating tube 20 of the type marketed ~ under the name '~QNEL" (Reg. Trademark). Crimped at the end of cord 20 is a mini-detonator 21. Mini-de~onator 21 comprises a thin-walled metal tube closed at one end and containing a pressed charge of a primary explosive 22, for example, lead azide in an amount of about O.S grains or less. Mini-detonator 21 is fixed to cord 20 by means of circular crimp 23 --- 10~681Z
and is adapted for snap-it insertion into chamber 10 of plug 8 (Fig. 1). Upon insertion, the recess of crimp 23 is engaged and held by rim 13. The use of mini-detonator 21 provides a convenient means of transmitting low energy from cord 20, gives water proofness to cord 20, and provides a convenient snap-fit means of coupling cord 20 to plug 8.
Referring to Fig. 3, there is shown a length of conventional low energy detonating cord (LEDC) 30 of the type marketed under the name "ANOLINE" (Reg. Trademark).
Because of the available energy of LEDC, no attached mini-detonator is required to initiate the attached delay assembly. At the end of cord 30 is shown a tight-fitting water-proofing end cap 31 of, for example, a resilient plastic material such as polyethylene. End cap 31 comprises a closed end wall 32 which is easily ruptured upon the detonation of cord 30. End cap 31 also comprises a circular recessed area 33 adapted for snap-fit engagement with rim 13 of plug 8 (Fig. 1). Cap 31 may be additionally held on the end of cord 30 by means of an adhesive.
Initiating units comprising, for example, the type shown in Fig. 2, may be factory-assembled and sold in varying lengths of cord 20. Similarly, the delay unit of Fig. 1 may be provided in a wide range of delay periods. In the field, the blaster need only select his choice of delay detonator and simply couple it with an initiating cord of appropriate length to provide a desired combination for the work under-taken. He thereafter places the delay assembly in contact w ith the explosive to be detonated and initiates the low energy cord or shock wave conductor in a known manner.
The quantity of primary explosive utilized in mini-detonator 21 must necessarily be sufficient so that upon detonation, diaphragm 12 of plug 8 will be ruptured and powder core 7 of element 6 ignited. While about 0.5 grains of lead azide has been found to be a suitable charge for the mini-detonator, in many cases lesser amounts of primary explo-sive may be employed. Similarly the thickness of the end wall 32 of water-proofing cap 31 used with low energy detonating cord (LEDC) will be chosen so that both the cap end 32 and diaphragm 12 of plug 8 will be ruptured upon detonation of 0 LEDC 30 and powder core 7 ignited.
EXAMPLE
A lot of 15 mini-detonators were manufacture from aluminium CUp9 having dimensions of 0.125 inch inside diameter, 0.137 inch outside diameter and 0.735 inch in depth. A charge of 0.5 grain of lead azide was pressed into the base of each cup at a pressure of 50 psig. Each mini-detonator was attache~
to a length of "NONEL" shock wave conductor by means of a circular crimp as shown at 23 in Fig. ~ of the drawing. m e mini-detonator/shock wave conductorassembly was then inserted into chamber 10 of a non-electric detonator as shown in Fig. 1 of the drawing with the closed end of the mini-detonator close to diaphragm 12. Each shock wave conductor was then initiated by known means and in 15 of 15 tests the delay detonator was exploded in the expected time-delay interval. The detonation of the mini-detonator was sufficiently forceful to rupture diaphragm 12 and ignite powder train 7 without causing mal-function of the delay train and explosive charge within shell 1.
It will be obvious to those skilled in the art that the quantity of explosive charge 22 in mini-detonator 21 will necessarily have to be limited so that operation of the delay ~ ~etonator is achieved without premature destruction or damage thereof.
The invention thus provides a non-electric delay blasting assembly which may be easily and safely assembled in the field to provide a wide range of combinations of delay periods and initiator lengths.
Claims (3)
1. A non-electric delay blasting assembly adapted to be initiated by means of low energy detonating cord or low energy shock wave conductor tubing comprising a cup-shaped metallic shell open at one end and containing in sequence from the bottom and within said shell, at least one explosive charge, a delay train and a resilient closure plug, said closure plug comprising a cylindrical body having a central channel therethrough divided into two cylindrical compartments by means of an integral ruptur-able diaphragm located across said channel, one of said compartments being in communication with said delay train and the second of said compartments being adapted to receive therein in gripping relationship the energy trans-mitting end of a length of low energy detonating cord or low energy shock wave conductor tubing.
2. An assembly as claimed in Claim 1, wherein said resilient closure plug is made from a thermoplastic material.
3. In a method of delay blasting employing a non-electric initiation system an improvement which com-prises providing a non-electric delay blasting assembly comprising a cup-shaped metallic shell open at one end and containing in sequence from the bottom and within said shell, at least one explosive charge, a delay train and and a resilient closure plug, said closure plug, having a central channel therethrough which channel is divided into two cylindrical compartments by means of an integral rupturable diaphragm across said channel, inserting the energy-trans-mitting end of a length of low energy detonating cord or low energy shock wave conductor into said channel in gripping relationship therewith to abut said diaphragm, placing said assembly in contact with an explosive charge to be detonated and initiating said low energy cord or shock wave conductor.
Priority Applications (15)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA256,213A CA1046812A (en) | 1976-07-02 | 1976-07-02 | Delay blasting assembly |
| NZ184400A NZ184400A (en) | 1976-07-02 | 1977-06-15 | Blasting assembly; resilient plug with rupurable diaphragm |
| AU26163/77A AU502331B2 (en) | 1976-07-02 | 1977-06-16 | Delay blasting assembly |
| GB25837/77A GB1524789A (en) | 1976-07-02 | 1977-06-21 | Delay blasting assembly |
| DK278777A DK278777A (en) | 1976-07-02 | 1977-06-23 | NON-ELECTRICAL DELAY EXPLOSION |
| NO772241A NO143401C (en) | 1976-07-02 | 1977-06-24 | NON-ELECTRICAL DEVICE FOR DELAYED BLASTING |
| BR7704175A BR7704175A (en) | 1976-07-02 | 1977-06-27 | DELAY DETONATING UNIT AND DELAY EXPLOSION PROCESS |
| BE178849A BE856200A (en) | 1976-07-02 | 1977-06-28 | DELAY DETONATING ARTIFICE |
| AR268226A AR212119A1 (en) | 1976-07-02 | 1977-06-28 | NON-ELECTRIC DEVICE FOR BLASTING WITH DELAYED EXPLOSION |
| SE7707619A SE7707619L (en) | 1976-07-02 | 1977-06-30 | EXPLOSIVES |
| DE2729683A DE2729683C3 (en) | 1976-07-02 | 1977-06-30 | Non-electric delay explosive device |
| PT66757A PT66757B (en) | 1976-07-02 | 1977-07-01 | Delay blasting assembly |
| FR7720355A FR2356905A1 (en) | 1976-07-02 | 1977-07-01 | DELAY DETONATING ARTIFICE |
| MX169703A MX146760A (en) | 1976-07-02 | 1977-07-01 | IMPROVED NON-ELECTRIC DETONATOR TO DYNAMATE WITH DELAY |
| JP7850477A JPS536408A (en) | 1976-07-02 | 1977-07-02 | Nonelectric apparatus for retarded blasting and process utilizing this apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA256,213A CA1046812A (en) | 1976-07-02 | 1976-07-02 | Delay blasting assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1046812A true CA1046812A (en) | 1979-01-23 |
Family
ID=4106347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA256,213A Expired CA1046812A (en) | 1976-07-02 | 1976-07-02 | Delay blasting assembly |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS536408A (en) |
| AR (1) | AR212119A1 (en) |
| AU (1) | AU502331B2 (en) |
| BE (1) | BE856200A (en) |
| BR (1) | BR7704175A (en) |
| CA (1) | CA1046812A (en) |
| DE (1) | DE2729683C3 (en) |
| DK (1) | DK278777A (en) |
| FR (1) | FR2356905A1 (en) |
| GB (1) | GB1524789A (en) |
| MX (1) | MX146760A (en) |
| NO (1) | NO143401C (en) |
| NZ (1) | NZ184400A (en) |
| PT (1) | PT66757B (en) |
| SE (1) | SE7707619L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5501151A (en) * | 1994-10-21 | 1996-03-26 | The Ensign-Bickford Company | Alternate signal path isolation member and non-electric detonator cap including the same |
| US5631440A (en) * | 1994-10-21 | 1997-05-20 | The Ensign-Bickford Company | Universal isolation member and non-electric detonator cap including the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000040917A1 (en) * | 1999-01-08 | 2000-07-13 | Dynamit Nobel Gmbh Explosivstoff- Und Systemtechnik | Control module for triggering units for initiating pyrotechnical elements |
| PE20130595A1 (en) * | 2011-10-14 | 2013-05-09 | Famesa Explosivos S A C | SIGNAL TRANSMISSION TUBE WITH REVERSE INITIATION RETENTION SEAL |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB190928532A (en) * | 1909-12-07 | 1910-06-30 | Kynoch Ltd | Improvements in Electric Fuses and Detonators for Blasting and the like. |
| BE546106A (en) * | 1955-03-15 | |||
| BE550057A (en) * | 1955-08-03 | |||
| GB902643A (en) * | 1959-10-02 | 1962-08-09 | Ici Ltd | Improvements in or relating to electric detonators |
| US3106892A (en) * | 1961-12-27 | 1963-10-15 | Du Pont | Initiator |
| GB982364A (en) * | 1962-11-13 | 1965-02-03 | Canadian Ind | Improvements in or relating to a blasting assembly |
| CA955110A (en) * | 1971-12-01 | 1974-09-24 | Frederik Van Zeggeren | Delay elements for blasting caps |
| US3895577A (en) * | 1973-09-25 | 1975-07-22 | Hercules Inc | Long burning delay blasting caps |
| US3939772A (en) * | 1974-10-04 | 1976-02-24 | Hercules Incorporated | Blasting caps initiatable by thermal detonation energy of an explosive gas mixture, and blasting system |
-
1976
- 1976-07-02 CA CA256,213A patent/CA1046812A/en not_active Expired
-
1977
- 1977-06-15 NZ NZ184400A patent/NZ184400A/en unknown
- 1977-06-16 AU AU26163/77A patent/AU502331B2/en not_active Expired
- 1977-06-21 GB GB25837/77A patent/GB1524789A/en not_active Expired
- 1977-06-23 DK DK278777A patent/DK278777A/en unknown
- 1977-06-24 NO NO772241A patent/NO143401C/en unknown
- 1977-06-27 BR BR7704175A patent/BR7704175A/en unknown
- 1977-06-28 BE BE178849A patent/BE856200A/en unknown
- 1977-06-28 AR AR268226A patent/AR212119A1/en active
- 1977-06-30 DE DE2729683A patent/DE2729683C3/en not_active Expired
- 1977-06-30 SE SE7707619A patent/SE7707619L/en unknown
- 1977-07-01 FR FR7720355A patent/FR2356905A1/en not_active Withdrawn
- 1977-07-01 PT PT66757A patent/PT66757B/en unknown
- 1977-07-01 MX MX169703A patent/MX146760A/en unknown
- 1977-07-02 JP JP7850477A patent/JPS536408A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5501151A (en) * | 1994-10-21 | 1996-03-26 | The Ensign-Bickford Company | Alternate signal path isolation member and non-electric detonator cap including the same |
| US5631440A (en) * | 1994-10-21 | 1997-05-20 | The Ensign-Bickford Company | Universal isolation member and non-electric detonator cap including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| NO143401C (en) | 1981-02-04 |
| PT66757A (en) | 1977-08-01 |
| NO143401B (en) | 1980-10-27 |
| GB1524789A (en) | 1978-09-13 |
| SE7707619L (en) | 1978-01-03 |
| PT66757B (en) | 1978-12-14 |
| NZ184400A (en) | 1979-10-25 |
| FR2356905A1 (en) | 1978-01-27 |
| BR7704175A (en) | 1978-06-06 |
| MX146760A (en) | 1982-08-11 |
| AR212119A1 (en) | 1978-05-15 |
| DK278777A (en) | 1978-01-03 |
| DE2729683B2 (en) | 1979-10-04 |
| DE2729683A1 (en) | 1978-02-09 |
| JPS536408A (en) | 1978-01-20 |
| NO772241L (en) | 1978-01-03 |
| AU2616377A (en) | 1978-12-21 |
| BE856200A (en) | 1977-12-28 |
| AU502331B2 (en) | 1979-07-19 |
| DE2729683C3 (en) | 1980-06-12 |
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