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US2503250A
Expired / Lapsed
US
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Air conditioning apparatus for high-speed aircraft
Assignee: Individual
•
Filing: 1948-06-02
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Granted: 1950-04-11
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Expires: 1968-06-02
Abstract
No abstract record available.
Inventors
- 👤 Ernst R G Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:05
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D2013/0603; B64D2013/0644; B64D2013/0681; Y; Y02; Y02T; Y02T50/00; Y02T50/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2391838A
Cited
US2453923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |