Patent US5224875A successfully refreshed from Google Patents.
Patent US2691818A successfully refreshed from Google Patents.
US2691818A
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Method and apparatus for use in making valve protector caps for compressed gas cylinders
Assignee: Individual
•
Filing: 1952-03-31
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Granted: 1954-10-19
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Expires: 1972-03-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Dean M Rockwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:49
CPC Classifications
B; B21; B21D; B21D41/00; B21D41/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T29/49863; Y10T29/49865; Y10T29/53; Y10T29/53987
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1679403A
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US1686562A
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US2177191A
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US2309181A
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US2329770A
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US2405201A
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US2406059A
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US2419862A
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US2431537A
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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) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |