US2498797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed varying transmission
Assignee: WINDFIELDS 1946 Ltd
•
Filing: 1944-07-12
•
Granted: 1950-02-28
•
Expires: 1964-07-12
Abstract
No abstract record available.
Inventors
- 👤 William A Duffield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:44
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1795464A
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US2064646A
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US2076974A
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US2188246A
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US2316390A
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US2343955A
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US2373234A
Cited
US2326994A
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US2355427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |