US2679169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic variable speed transmission
Assignee: Individual
•
Filing: 1950-06-16
•
Granted: 1954-05-25
•
Expires: 1970-06-16
Abstract
No abstract record available.
Inventors
- 👤 William A Duffield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:23
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1357769A
Cited
DE558445C
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FR723717A
Cited
GB461947A
Cited
US2074781A
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US2324703A
Cited
US2324713A
Cited
US2381772A
Cited
US2465739A
Cited
US2441490A
Cited
US2498797A
Cited
US2555702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |