US3214506A - Method for making hollow plastic rotational casting and for removing casting from mold - Google Patents
Method for making hollow plastic rotational casting and for removing casting from mold Download PDFInfo
- Publication number
- US3214506A US3214506A US227330A US22733062A US3214506A US 3214506 A US3214506 A US 3214506A US 227330 A US227330 A US 227330A US 22733062 A US22733062 A US 22733062A US 3214506 A US3214506 A US 3214506A
- Authority
- US
- United States
- Prior art keywords
- mold
- spout
- casting
- liquid
- hollow casting
- 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 - Lifetime
Links
- 238000005266 casting Methods 0.000 title claims description 46
- 238000000034 method Methods 0.000 title description 6
- 239000004033 plastic Substances 0.000 title description 6
- 229920003023 plastic Polymers 0.000 title description 6
- 238000010106 rotational casting Methods 0.000 title 1
- 239000000463 material Substances 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011344 liquid material Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000013022 venting Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000012768 molten material Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 235000015842 Hesperis Nutrition 0.000 description 2
- 235000012633 Iberis amara Nutrition 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
Definitions
- One of the particular objects of the invention is to produce a hollow casting which has a very uniform wall thickness throughout all critical areas.
- Another object is to produce a hollow casting having reduced ends and uniform wall thickness.
- This environment is in the field of jet-propelled objects or rockets.
- the directional jets of rockets require a closed container with a jet nozzle for holding the propellant charge such as solid fuel.
- these containers are commonly made of spun glass fiber and plastic wound on a mandrel, the layers being wound in alternation in oblique and straight circumferential directions when a portion of the container is cylindrical and the ends closed, as hemispherical for example.
- composition material which is well suited for making hollow mandrels. It is referred to as a plastic but it appears to be crystalline and electrolytic and has a latent heat of melting and solidifying like water and, like water, portions solidify in the presence of residual liquid, like ice forming in water.
- a plastic but it appears to be crystalline and electrolytic and has a latent heat of melting and solidifying like water and, like water, portions solidify in the presence of residual liquid, like ice forming in water.
- Paraplast Paraplast
- Rezolin Inc. of Santa Monica, California. This material is very hard like cement when solid and has the necessary rigidity and strength to make very satisfactory winding mandrels. It is also soluble in water and this makes its removal easy after the container has been formed.
- the mandrel is simply dissolved in water and drained out of the container, this being done without in any way damaging the inside surface of the container as is likely to occur when the mandrel must be broken or scraped out of the container.
- This plastic material of a type suitable for making hollow cast mandrels, melts at about 400 degrees F. to 500 degrees F. and can be kept in a clean melted form ready for use in a closed electric resistance melting furnace.
- the fact that the material solidifies in the presence of liquid portions requires that from the very beginning of solidification the material must be evenly distributed or washed over the surfaces of the mold in which it is solidified, with no appreciable time allowed for the start of solidification before the liquid circulation 3,2l4,5% Patented Get. 26, 1965 is started. It also requires that the mold walls be very uniform in thickness and Without local thick and thin zones over all critical areas; also that the apparatus which is used for turning the mold is free from local metallic contact with the mold, all support or securement elements being of heat insulating material. Further, the mold should be at the same temperature as the material at the time it is poured into the mold.
- gases need to be vented from the mold during solidification of material in the mold.
- it has been the practice to cast in successive stages or to break through the material at some point after solidification to vent the gases.
- the necessary factors for certainly and quickly making good hollow castings are provided by a combination of suitable apparatus and procedure of an improved nature.
- FIG. 1 is a medial axial section through a mold embodying the invention
- FIG. 2 is a right end elevation, partly in section, of the mold shown in FIG. 1;
- FIG. 3 is a side elevation of a mold being assembled for use
- FIG. 4 is a diagrammatic section and elevation of a mold in a preheating furnace
- FIG. 5 is a diagrammatic view of a mold secured in a cage of a gyratory turning device and molten material being poured into the mold from a melting furnace;
- FIG. 6 is a sectional diagrammatic view showing how molten material is held in the mold without spilling when the interior fill and vent spout is in its lowest position;
- FIG. 7 is a sectional diagrammatic view showing how molten material is held in the mold when the fill and vent spout is disposed horizontally;
- FIG. 8 is a diagrammatic view showing the mold being turned in the gyroscopic or gimbal machine to form an even thickness of material as it hardens;
- FIG. 9 is a partial section of the drive end of the mandrel after the dummy pole piece and mold end cap at that end have been removed;
- FIG. 10 is a transverse section taken on the line 1010 of FIG. 9;
- FIG. 11 is a sectional view showing how the mandrel is removed from the cylindrical part of the mold.
- FIG. 12 is a central axial section of a finished mandrel.
- the mold as of aluminum, is generally designated by the numeral 20 and includes a cylindrical body section 21, a bottom cap section 22 of semispherical shape, and a top or fill cap section 23 of semispherical shape.
- the sections are secured together at interfitting joints which are of the same thickness as the remainder of the mold Wall, each joint including an inner concentric rib 24 on one section fitting within an annular recess 25 of the adjacent section and an outer concentric rib 26 on the second section fitting within an annular recess 27 in the first section.
- the inner rib or projection 24 is radially thicker than the outer rib or projection 26 and its end surface engages the end surface of the recess 25; whereas the end surface of the outer projection 26 is spaced slightly away from the end wall of the recess 27. This provides that when the mold sections are forced to- 3 gether, as by clamping means, the inside surface of the mold will be fluid tight.
- the mold is completed by a bottom or drive end dummy pole piece 34 and a top or fill end dummy pole piece 35.
- the pole pieces are located by positioning pins 36 and are secured to the mold caps by cap screws 37, both pins and screws extending through a flange 38.
- Threaded holes 39 are provided in the flanges 38 of the pole pieces to take reaction cap screws 39a for forcing the pole pieces away from the mold caps (by Wheel-puller action) after the cap screws 37 have been removed when disassembling the parts.
- a dummy drive pin 40 is carried on the inner side of the dummy pole piece 34 for making a hole in the casting to take an active drive pin of an active pole piece which is used to turn the cast mandrel when the shell is later wound on it.
- a dummy center core plug 41 is also carried on the inner side of the dummy pole piece 34 to center the plug of the active drive pole piece when later secured on the cast mandrel.
- a fill tube or spout 43 is carried on the inner side of the dummy pole piece 35, the pole piece having a hole 44 forming a continuation of the bore of the tube.
- the tube may either be made integral with the pole piece or screwed into a threaded hole therein.
- the tube is tapered on the outer surface for easy removal from the material which hardens around it.
- FIG. 1 the approximate inner outline of the cast mandrel M which is to be formed is indicated by broken lines.
- FIG. 3 the parts 21, 22 and 23 are shown as being assembled to form the full mold 20, the dummy pole pieces 34 and 35 having been assembled on the caps 22 and 23.
- the fill spout 43 is shown on the top pole piece.
- FIG. 4 the assembled mold 20 is shown in an electric resistance muffie heating chamber 50 where it is brought up to a temperature somewhat above that of the material to be poured into it so as to be at about the pouring temperature after being taken out of the heating chamber.
- the pouring temperature may be about 500 degrees F., so the mold is heated to about 530 degrees F. to allow for cooling before use.
- Care is taken to heat the mold evenly around its circumference and from end-toend, as by a plurality of circumferentially spaced axially disposed electrical heating elements spaced at a short distance from the mold and controlled by a spirally disposed thermostatic element of known type.
- the top 54 of the cage may be provided with hinges 55 and a quick-lock means 56 for securing the mold tightly in position in a minimum time.
- the top of the mold is open for pouring material into its spout hole and the body of the mold is almost completely exposed to the air for even cooling.
- the mold holding cage 51 is mounted on a gyroscopic or gimbal device 60 having casters 61 for ready movement about on the floor. It may be taken to a material melting furnace 63 where the material is kept at a fixed temperature and which is provided with means for pouring a predetermined amount of material as required for a casting. By this arrangement it is not necessary to pour part of the material back out of the mold after a part of desired thickness has been formed as has been a prior practice, at least to some extent, with the type of material herein used.
- the .mold is checked by a test thermostat and when it has cooled to the temperature of the material in the furnace a measured amount of molten material is poured into it from the furnace through a trough 64. While not shown in detail, it is understood that there is a liquid flow control device or gate 65 on the furnace above the trough 64.
- the interior fill and vent spout 43 of the mold is a carefully designed and very important part of the mold assembly. It has a bore opening of a diameter large enough to provide easy and rapid pouring of molten liquid into the mold and yet of a diameter small enough to avoid the outflow of liquid when the mold is turned on the side, as shown in FIG. 7. This must be maintained even if the tubular middle section of the mold is omitted and the two end caps are secured directly together (as the joints provide, as may be observed from FIG. 1) to form a spherical hollow casting instead of a spherical casting with semi-cylindrical ends, as shown.
- the fill spout must be long enough to prevent liquid from flowing out when the mold is turned to a position with the tube end downward, yet short enough to avoid contact with liquid material when the mold spout is in the top position, even for a simple spherical mold.
- gases are vented at all times while the mold is being turned about two axes and the material is hardening as the mold cools, yet no liquid can spill out an any time or get into the spout to hinder the venting of gases.
- the mold is turned until the material all hardens. To aid this the air may be caused to flow past the mold, as by a fan.
- the present mold has been especially designed to permit easy removal without injuring the cast article.
- the cap screws 37 of the dummy pole piece 34 are removed and the pull-off cap screws 39a are turned in to press their ends against the end surface of the bottom end cap 22 thus forcing the dummy pole piece out of the cap 22 and casting.
- the drive pin 40 and core plug 41 may either come off with the pole piece or be left in the casting. If left in the casting they may easily be removed by tapping on them to loosen them from the casting and then pulling them out.
- a rod is then inserted in the hole thus made in the bottom end of the casting and the spout 43 is rapped on the sides by the rod to break up the thin coating of hardened material M2 which has formed on it.
- cap screws 37 of the top dummy pole piece 35 are removed and the pull-off screws 39a turned in, as for the bottom dummy pole piece, and the top pole piece with its pouring spout 43 removed.
- cap screws 31 and the pins 30 for the joints are removed and the caps 22 and 23 are removed from the casting.
- the bottom cap could be left on until the casting has been removed, if desired, since part of the other end is exposed for engagement for pushing the casting out of the mold.
- the mold is wrapped on the outside by a layer of heat insulating material 70, as a glass wool mat, and air is blown through the interior of the casting, as by a blower 71, to cause the casting to shrink in the cylindrical mold part 21.
- a layer of heat insulating material 70 as a glass wool mat
- the finished casting is shown in FIG. 12. Since it is hygroscopic it is wrapped in a moisture excluding covering, as a sealed polyethylene bag, before shipment. It is usual also to secure pole pieces in the ends to assist in handling.
- the casting has very uniform wall thickness throughout the entire outer surface on which the subsequent windings will exert radial pressure, only the ends at the pole pieces being of non-uniform thickness but here it does not matter.
- the invention provides an improved method for making uniformly better mandrel castings than have heretofore been attainable.
- a metal mold with a cylindrical mid-portion and generally hemispherical end caps having end openings and equatorial transverse joints with the cylindrical mid-portion, the mold having walls of uniform thickness, including the joints, over all outer curved areas,
- the bottom end pole piece having a hole-defining core plug and the top end pole piece having an interior fill and vent spout of a diameter to permit quick filling with liquid material but preventing outflow of liquid when the mold is turned on the side and having a length such that liquid cannot flow out when the spout is disposed lowermost but short enough to prevent liquid from engaging the spout when it is disposed uppermost,
- a separable metal mold having generally spherical-shaped end caps with axial openings therein, said mold having circumferential joints and walls of uniform thickness including the joints,
- one of said pole pieces having a hole-defining core plug and the other having an interiorly-extending fill and vent spout of a diameter to permit quick filling with liquid material but preventing outflow of liquid when the mold is turned on the side and having a length such that liquid cannot flow out when the spout is disposed lowermost but short enough to prevent liquid from engaging the spout when it is disposed uppermost,
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US227330A US3214506A (en) | 1962-10-01 | 1962-10-01 | Method for making hollow plastic rotational casting and for removing casting from mold |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US227330A US3214506A (en) | 1962-10-01 | 1962-10-01 | Method for making hollow plastic rotational casting and for removing casting from mold |
Publications (1)
Publication Number | Publication Date |
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US3214506A true US3214506A (en) | 1965-10-26 |
Family
ID=22852663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US227330A Expired - Lifetime US3214506A (en) | 1962-10-01 | 1962-10-01 | Method for making hollow plastic rotational casting and for removing casting from mold |
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US (1) | US3214506A (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3502856A (en) * | 1967-07-27 | 1970-03-24 | Structural Electric Products C | Hermetically sealed light fixture inset in a roadway |
US3655309A (en) * | 1967-11-15 | 1972-04-11 | Burroughs Corp | Rotating fixture-mold for fabricating printing drums |
US3909179A (en) * | 1972-05-26 | 1975-09-30 | Funabashi Kasei Co Ltd | Bi-axially rotational synthetic resin molding machine |
US4101619A (en) * | 1974-08-26 | 1978-07-18 | Marvin Glass & Associates | Method of making a doll head |
EP0195718A1 (en) * | 1985-03-22 | 1986-09-24 | Commissariat A L'energie Atomique | Artificial skull, prosthetic head built up from the skull and process for producing them |
US4666650A (en) * | 1983-08-09 | 1987-05-19 | Phillips Petroleum Company | Method and apparatus for molding hollow articles |
US4690632A (en) * | 1983-08-09 | 1987-09-01 | Phillips Petroleum Company | Method and apparatus for molding hollow articles |
US4705468A (en) * | 1985-11-18 | 1987-11-10 | Essef Corporation | Apparatus for rotationally casting a plastic tank liner having an access fitting |
FR2612447A1 (en) * | 1987-03-19 | 1988-09-23 | Cochois Marc | Method and device for the manufacture of a craft of the canoe or kayak type |
EP0297196A1 (en) * | 1987-04-03 | 1989-01-04 | Chell Snc | Mould for manufacturing plastics objects having different heights and mouthpieces |
US5196208A (en) * | 1990-07-23 | 1993-03-23 | Bando Kagaku Kabushiki Kaisha | Apparatus for removing cylindrical moldings from molds |
US5277861A (en) * | 1990-10-11 | 1994-01-11 | Bergen Barrel & Drum Co. | Industrial drum molding |
US5922267A (en) * | 1995-12-05 | 1999-07-13 | Toter, Inc. | Method of making a rotationally molded container rim |
US6293779B1 (en) * | 1999-01-21 | 2001-09-25 | Knight Manufacturing, Co., Inc. | Fishing lure mold and fishing lure |
US20060060593A1 (en) * | 2004-09-17 | 2006-03-23 | Maggio Richard A Sr | Molded plastic waste container with integral side channels for receiving lifting prongs and method |
US20060159518A1 (en) * | 2004-11-24 | 2006-07-20 | The Granger Plastics Company | Shoreline erosion barrier and method |
US20070034633A1 (en) * | 2004-09-17 | 2007-02-15 | Global Distributors Llc | Rotationally molded plastic waste container with integral channels for receiving lifting prongs and method |
US11224998B2 (en) | 2016-01-14 | 2022-01-18 | Tennant Company | Thread forming apparatus and method for rotationally molded product |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1328887A (en) * | 1917-06-15 | 1920-01-27 | Nitzgen Joseph | Molding apparatus |
US1595409A (en) * | 1924-08-25 | 1926-08-10 | Clarence A Notman | Golf-ball mold |
US1784686A (en) * | 1927-06-23 | 1930-12-09 | Gen Chemical Corp | Process and apparatus for producing wax bottles |
US2280636A (en) * | 1940-04-17 | 1942-04-21 | Gen Tire & Rubber Co | Latex rubber casting |
US2442550A (en) * | 1945-04-19 | 1948-06-01 | George A Rubissow | Method of and apparatus for casting |
US2890514A (en) * | 1956-06-04 | 1959-06-16 | Sylvania Electric Prod | Ceramic products |
US2946092A (en) * | 1958-08-04 | 1960-07-26 | Barr Rubber Products Company | Apparatus for rotationally distributing a liquid charge within a mold |
-
1962
- 1962-10-01 US US227330A patent/US3214506A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1328887A (en) * | 1917-06-15 | 1920-01-27 | Nitzgen Joseph | Molding apparatus |
US1595409A (en) * | 1924-08-25 | 1926-08-10 | Clarence A Notman | Golf-ball mold |
US1784686A (en) * | 1927-06-23 | 1930-12-09 | Gen Chemical Corp | Process and apparatus for producing wax bottles |
US2280636A (en) * | 1940-04-17 | 1942-04-21 | Gen Tire & Rubber Co | Latex rubber casting |
US2442550A (en) * | 1945-04-19 | 1948-06-01 | George A Rubissow | Method of and apparatus for casting |
US2890514A (en) * | 1956-06-04 | 1959-06-16 | Sylvania Electric Prod | Ceramic products |
US2946092A (en) * | 1958-08-04 | 1960-07-26 | Barr Rubber Products Company | Apparatus for rotationally distributing a liquid charge within a mold |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3502856A (en) * | 1967-07-27 | 1970-03-24 | Structural Electric Products C | Hermetically sealed light fixture inset in a roadway |
US3655309A (en) * | 1967-11-15 | 1972-04-11 | Burroughs Corp | Rotating fixture-mold for fabricating printing drums |
US3909179A (en) * | 1972-05-26 | 1975-09-30 | Funabashi Kasei Co Ltd | Bi-axially rotational synthetic resin molding machine |
US4101619A (en) * | 1974-08-26 | 1978-07-18 | Marvin Glass & Associates | Method of making a doll head |
US4666650A (en) * | 1983-08-09 | 1987-05-19 | Phillips Petroleum Company | Method and apparatus for molding hollow articles |
US4690632A (en) * | 1983-08-09 | 1987-09-01 | Phillips Petroleum Company | Method and apparatus for molding hollow articles |
EP0195718A1 (en) * | 1985-03-22 | 1986-09-24 | Commissariat A L'energie Atomique | Artificial skull, prosthetic head built up from the skull and process for producing them |
US4705468A (en) * | 1985-11-18 | 1987-11-10 | Essef Corporation | Apparatus for rotationally casting a plastic tank liner having an access fitting |
FR2612447A1 (en) * | 1987-03-19 | 1988-09-23 | Cochois Marc | Method and device for the manufacture of a craft of the canoe or kayak type |
EP0297196A1 (en) * | 1987-04-03 | 1989-01-04 | Chell Snc | Mould for manufacturing plastics objects having different heights and mouthpieces |
US5196208A (en) * | 1990-07-23 | 1993-03-23 | Bando Kagaku Kabushiki Kaisha | Apparatus for removing cylindrical moldings from molds |
US5277861A (en) * | 1990-10-11 | 1994-01-11 | Bergen Barrel & Drum Co. | Industrial drum molding |
US5922267A (en) * | 1995-12-05 | 1999-07-13 | Toter, Inc. | Method of making a rotationally molded container rim |
US6293779B1 (en) * | 1999-01-21 | 2001-09-25 | Knight Manufacturing, Co., Inc. | Fishing lure mold and fishing lure |
US20060060593A1 (en) * | 2004-09-17 | 2006-03-23 | Maggio Richard A Sr | Molded plastic waste container with integral side channels for receiving lifting prongs and method |
US20070034633A1 (en) * | 2004-09-17 | 2007-02-15 | Global Distributors Llc | Rotationally molded plastic waste container with integral channels for receiving lifting prongs and method |
US7237689B2 (en) | 2004-09-17 | 2007-07-03 | Global Distributors Llc | Molded plastic waste container with integral side channels for receiving lifting prongs and method |
US20060159518A1 (en) * | 2004-11-24 | 2006-07-20 | The Granger Plastics Company | Shoreline erosion barrier and method |
US11224998B2 (en) | 2016-01-14 | 2022-01-18 | Tennant Company | Thread forming apparatus and method for rotationally molded product |
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Legal Events
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AS | Assignment |
Owner name: CORBIN, GRACE H. Free format text: WRIT OF EXECUTION BY COURT;ASSIGNOR:CORBIN, GEORGE T. JR.;REEL/FRAME:003884/0854 Effective date: 19810618 Owner name: CORBIN, GRACE H., STATELESS Free format text: WRIT OF EXECUTION BY COURT;ASSIGNOR:CORBIN, GEORGE T. JR.;REEL/FRAME:003884/0854 Effective date: 19810618 |
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Owner name: CORBIN SALES CORPORATION, P.O. BOX 71 UNION LANDIN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CORBIN, GEORGE T., JR.;REEL/FRAME:004058/0166 Effective date: 19820802 |
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AS | Assignment |
Owner name: PHILLIPS PETROLEUM COMPANY A CORP.OF DE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CARROW, GUY E.;REEL/FRAME:004330/0297 Effective date: 19830802 |