Patent US2631796A successfully refreshed from Google Patents.
US2631796A
Expired / Lapsed
US
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Aircraft jet engine cooling system
Assignee: Northrop Grumman Corp
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Filing: 1950-07-24
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Granted: 1953-03-17
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Expires: 1970-07-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Loyal A Williamson
- 👤 Jr George H Schwab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:42
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/12; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |