Patent US1503090A successfully refreshed from Google Patents.
Patent US3929960A successfully refreshed from Google Patents.
US3929960A
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US
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Method for producing oriented plastic shotshells
Assignee: PPG Architectural Coatings Canada Inc
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Filing: 1973-10-01
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Granted: 1975-12-30
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Expires: 1993-10-01
Abstract
Abstract An integral, oriented polyolefinic shotshell is provided by a method whereby a tubular blank of material is advanced into a die cavity and subsequently forced over a mandrel and partway through an annular space to form the tubular portion of the shell. The unformed portion of the blank is compressed to form the head of the shell and the completed shell is then removed from the die and stripped from the mandrel.
Inventors
- 👤 Donald Urquhart Findlay
- 👤 Francis Hamnet Garla Mccaffrey
- 👤 Derek Edgar Alexander Scuffell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:30
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/26; F42B5/30; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/475; B29C55/00; B29C55/02; B29C55/18; B29C48/03; B29C48/09; Y; Y10; Y10S; Y10S264/00; Y10S264/66
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
233 words
A METHOD OF PRODUCING AN INTEGRAL, ORIENTED, CRYSTALLINE POLYOLEFINIC SHOTGUN CARTRIDGE HAVING AN ENLARGED HEAD PORTION COMPRISING THE STEPS OF: A. HEATING AN ELONGATED, OPEN-ENDED, THICK-WALLED TUBULAR BLANK OF CRYSTALLINE POLYOLEFINIC MATERIAL TO A TEMPERATURE BETWEEN ABOUT 80*CF. AND 240*F., BUT BELOW THE CRYSTALLINE MELTING POINT OF SAID POLYLEFINIC MATERIAL; B. ADVANCING SAID HEATED BLANK INTO A SUBSTANTIALLY CYLINDRICAL DIE CAVITY HAVING AN ENLARGED CIRCUMFERENTIAL HEAD END POSITION BY MEANS OF A RECIPROCATING MANDREL; C. FORCING SAID BLANK LONGITUDINALLY FOR A DISTANCE EQUAL TO PART OF ITS LENGTH THROUGH AN ANNULAR SPACE DEFINED BY ONE OUTLET OF SAID DIE CAVITY AND SAID MANDREL ON THE ACTION OF A RECIPROCATING RAM IN SUCH A WAY THAT SAID BLANK IS EXPANDED CIRCUMFERENTIALLY OVER SAID MANDREL AND REDUCED IN WALL THICKNESS BY EXTRUSION THROUGH SAID ANNULAR SPACE TO FORM A BIAXIALLY ORIENTED TUBELIKE STRUCTURE AND SIMULTANEOUSLY COMPRESSING THE PORTION OF SAID TUBULAR BLANK WHICH HAS NOT BEEN ADVANCED THROUGH SAID ANNULAR SPACE INTO THE SHAPE OF A FORMED, SHOTSHELL HEAD AND BASE WAD INTEGRAL WITH THE SAID ORIENTEDD TUBELIKE STRUCTURE AND HAVING AN ENLARGED HEAD PORTION; D. RETRACTING THE SAID RAM AND FURTHER ADVANCING THE SAID MANDREL AND FORMED TUBELIKE STRUCTURE AND INTEGRAL SHOTSHELL HEAD THROUGH THE SAID DIE CAVITY; AND E. REVERSING THE DIRECTION OF MOVEMENT OF SAI MANDREL TO REMOVE THEREFORM SAID FORMED TUBELIKE STRUCTURE AND INTEGRAL SHOTSHELL HEAD HAVNG SAID ENLARGED HEATD POTION.
Claim 2
Independent Claim
233 words
A METHOD OF PRODUCING AN INTEGRAL, ORIENTED, CRYSTALLINE POLYOLEFINIC SHOTGUN CARTRIDGE HAVING AN ENLARGED HEAD PORTION COMPRISING THE STEPS OF: A. HEATING AN ELONGATED, OPEN-ENDED, THICK-WALLED TUBULAR BLANK OF CRYSTALLINE POLYOLEFINIC MATERIAL TO A TEMPERATURE BETWEEN ABOUT 80*CF. AND 240*F., BUT BELOW THE CRYSTALLINE MELTING POINT OF SAID POLYLEFINIC MATERIAL; B. ADVANCING SAID HEATED BLANK INTO A SUBSTANTIALLY CYLINDRICAL DIE CAVITY HAVING AN ENLARGED CIRCUMFERENTIAL HEAD END POSITION BY MEANS OF A RECIPROCATING MANDREL; C. FORCING SAID BLANK LONGITUDINALLY FOR A DISTANCE EQUAL TO PART OF ITS LENGTH THROUGH AN ANNULAR SPACE DEFINED BY ONE OUTLET OF SAID DIE CAVITY AND SAID MANDREL ON THE ACTION OF A RECIPROCATING RAM IN SUCH A WAY THAT SAID BLANK IS EXPANDED CIRCUMFERENTIALLY OVER SAID MANDREL AND REDUCED IN WALL THICKNESS BY EXTRUSION THROUGH SAID ANNULAR SPACE TO FORM A BIAXIALLY ORIENTED TUBELIKE STRUCTURE AND SIMULTANEOUSLY COMPRESSING THE PORTION OF SAID TUBULAR BLANK WHICH HAS NOT BEEN ADVANCED THROUGH SAID ANNULAR SPACE INTO THE SHAPE OF A FORMED, SHOTSHELL HEAD AND BASE WAD INTEGRAL WITH THE SAID ORIENTEDD TUBELIKE STRUCTURE AND HAVING AN ENLARGED HEAD PORTION; D. RETRACTING THE SAID RAM AND FURTHER ADVANCING THE SAID MANDREL AND FORMED TUBELIKE STRUCTURE AND INTEGRAL SHOTSHELL HEAD THROUGH THE SAID DIE CAVITY; AND E. REVERSING THE DIRECTION OF MOVEMENT OF SAI MANDREL TO REMOVE THEREFORM SAID FORMED TUBELIKE STRUCTURE AND INTEGRAL SHOTSHELL HEAD HAVNG SAID ENLARGED HEATD POTION.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein the said tubular blank is heated to a temperature between about 130*F. and 170*F.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein the crystalline polyolefin is high density polyethylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |