Patent US2638138A successfully refreshed from Google Patents.
US2638138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cell supporting enclosure
Assignee: Goodyear Aircraft Corp
•
Filing: 1949-01-07
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Granted: 1953-05-12
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Expires: 1969-01-07
Abstract
No abstract record available.
Inventors
- 👤 Leonard J Proebstle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:48
CPC Classifications
B; B64; B64D; B64D37/00; B64D37/02; B64D37/06; Y; Y02; Y02T; Y02T50/00; Y02T50/40; Y10; Y10S; Y10S220/00; Y10S220/90; Y10S220/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2406679A
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US2421613A
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US2446811A
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US2429688A
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US2360525A
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US2439562A
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US2381402A
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US2505348A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |