US2652216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft structure cooling means
Assignee: North American Aviation Corp
•
Filing: 1952-05-05
•
Granted: 1953-09-15
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Expires: 1972-05-05
Abstract
No abstract record available.
Inventors
- 👤 James D Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/78; F02K1/82; F02K1/822; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2177642A
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US2599879A
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US2404954A
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US2517524A
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US2539089A
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US2586299A
Cited
US2591676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |