US2437467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-speed drive for propellers
Assignee: KINNER MOTORS Inc
•
Filing: 1942-01-03
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Granted: 1948-03-09
•
Expires: 1962-01-03
Abstract
No abstract record available.
Inventors
- 👤 Earl R Herring
- 👤 Charles P Sander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:09
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/44; F16H3/72; F16H3/721; B; B64; B64D; B64D27/00; F16H3/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1564318A
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US1654432A
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US1702244A
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US2245815A
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FR851130A
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US2318481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |