US3559581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of thin-walled plastic shell casings
Assignee: BLANICKE STROJIRNY NARODNI PODNIK
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Filing: 1968-12-05
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Granted: 1971-02-02
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Expires: 1988-12-05
Abstract
Abstract A method for manufacturing plastic shell casings having relatively thin-walled tubular bodies. The tubular bodies of the shell casings manufactured in accordance with the method of this invention have cylindrical walls and a bottom which is integral with said cylindrical walls. The outer bottom edge of the shell casing has a rim member which extends downwardly therefrom. Cumulative liquid polymer plastic distribution means are mounted at the bottom of a mold having a shape corresponding to that of the finished plastic shell casing and inject liquid polymer plastic material into the mold by means of the slit injection molding technique.
Inventors
- 👤 Roman Kriz
- 👤 Josef Hrdina
- 👤 Josef Svejda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:47
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/26; F42B5/30; B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/2701; B29C45/2708; B29C2045/2714
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
Apparatus according to claim 1, wherein the means defining the rear, transverse outer wall of the mold cavity has an annular groove therein, said annular groove when filled with plastic material injected into the mold forming a rim projecting rearwardly from the rear end of the shell casing.
References Cited (Backward Citations)
US1187464A
Cited
US1605655A
Cited
US2684502A
Cited
GB735061A
Cited
FR1082088A
Cited
FR1095837A
Cited
FR68278E
Cited
CH355716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |