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Patent US2764458A successfully refreshed from Google Patents.
US2764458A
Expired / Lapsed
US
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Piston ring
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1953-10-12
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Granted: 1956-09-25
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Expires: 1973-10-12
Abstract
No abstract record available.
Inventors
- 👤 Robert M Ward
- 👤 Ivan R Kacir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:03
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/203; F16J9/206; Y; Y10; Y10S; Y10S277/00; Y10S277/924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2397636A
Cited
US2224338A
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US2313395A
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US2563667A
Cited
US2631073A
Cited
US2650143A
Cited
US2671705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |