US3929959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 blank of material is forced partway through an annular die and over a mandrel 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 The unformed portion of the blank is compressed to form the head of the shell and the completed shell is then withdrawn from the die and removed from the mandrel.
Inventors
- 👤 Donald Urquhart Findlay
- 👤 Francis Hamnet Garla Mcgaffrey
- 👤 Derek Edgar Alexander Scuffell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:57
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/26; F42B5/30; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0018; B29C48/0022; B29C48/03; B29C48/09; B29C48/10; Y; Y10; Y10S; Y10S264/00; Y10S264/66
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
METHOD OF PRODUCING AN INTEGRAL, ORIENTED, CRYSTALLINE POLYOLEFINIC SHOTGUN CARTIDGE COMPRISING THE STEPS OF: A. HEATING AN ELONGATED, OPEN-ENDED, THICKWALLLED TUBULAR BLANK OF CRYSTALLINE POLYOLEFINIC MATERIAL TO A TEMPERATURE BETWEEN ABOUT 80*F. AND 240*F., BUT BELOW THE CRYSTALLINE MELTING POINT OF SAID POLYOLEFINIC MATERIAL, B. FORCING SAID HEATED BLANK LONGITUDINALLY FOR A DISTANCE EQUAL TO PART OF ITS LENGTH THROUGH AN ANNULAR SPACE DEFINED BY A FIXED EXTERNAL DIE AND A MOVEALBE INTERNAL MANDREL IN SUCH A WAY THAT SAID BKANK IS EXPANDED CIRCUMFERENTIALLY OVER SAID MANDREL AND REDUCE IN WALL THICKNESS BY EXTRUSION THROUGH SAID ANNULAR SPACE TO FORM A BIAXIALLY ORENTED TUBELIKE STRUCTURE;
Claim 2
Dependent Claim
105 words
METHOD OF PRODUCING AN INTEGRAL, ORIENTED, CRYSTALLINE POLYOLEFINIC SHOTGUN CARTIDGE COMPRISING THE STEPS OF: A. HEATING AN ELONGATED, OPEN-ENDED, THICKWALLLED TUBULAR BLANK OF CRYSTALLINE POLYOLEFINIC MATERIAL TO A TEMPERATURE BETWEEN ABOUT 80*F. AND 240*F., BUT BELOW THE CRYSTALLINE MELTING POINT OF SAID POLYOLEFINIC MATERIAL, B. FORCING SAID HEATED BLANK LONGITUDINALLY FOR A DISTANCE EQUAL TO PART OF ITS LENGTH THROUGH AN ANNULAR SPACE DEFINED BY A FIXED EXTERNAL DIE AND A MOVEALBE INTERNAL MANDREL IN SUCH A WAY THAT SAID BKANK IS EXPANDED CIRCUMFERENTIALLY OVER SAID MANDREL AND REDUCE IN WALL THICKNESS BY EXTRUSION THROUGH SAID ANNULAR SPACE TO FORM A BIAXIALLY ORENTED TUBELIKE STRUCTURE;
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)
US2987775A
Cited
US3074115A
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US3205290A
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US3492387A
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US3284560A
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US3514468A
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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 |