Patent US2768039A successfully refreshed from Google Patents.
US2768039A
Expired / Lapsed
US
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Piston ring
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1954-02-03
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Granted: 1956-10-23
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Expires: 1974-02-03
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Cable
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:41
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/064; F16J9/066; F16J9/069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220948A
Cited
US2346898A
Cited
US2476948A
Cited
US2635022A
Cited
US2621989A
Cited
US2676076A
Cited
US2680045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |