US2815188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary power unit
Assignee: MARQUARDT AIRCRAFT CO
•
Filing: 1954-01-11
•
Granted: 1957-12-03
•
Expires: 1974-01-11
Abstract
No abstract record available.
Inventors
- 👤 Dwight D Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:08
CPC Classifications
F; F03; F03D; F03D7/00; F03D7/02; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR899619A
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US2613029A
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US2689680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |