Patent US2716581A successfully refreshed from Google Patents.
US2716581A
Expired / Lapsed
US
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Piston
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1951-10-13
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Granted: 1955-08-30
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Expires: 1971-10-13
Abstract
No abstract record available.
Inventors
- 👤 Townhill Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:38
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1781207A
Cited
GB401085A
Cited
GB425683A
Cited
GB460420A
Cited
FR913136A
Cited
US2589154A
Cited
US2583957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-29 | 1959-02-28 | 1959-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-29 | 1963-02-28 | 1963-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-29 | 1967-02-28 | 1967-08-30 | $7700.00 | Window Closed / Lapsed |