US2744802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston sealing assembly
Assignee: Northrop Grumman Corp
•
Filing: 1952-09-19
•
Granted: 1956-05-08
•
Expires: 1972-09-19
Abstract
No abstract record available.
Inventors
- 👤 Chalmers A Strayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:57
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US415097A
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US674234A
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US1284341A
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US1339939A
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US2029404A
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US2314683A
Cited
GB548291A
Cited
US2424901A
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US2437814A
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US2615769A
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US2456356A
Cited
US2631571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |