US2491087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air controlled shifting mechanism
Assignee: Individual
•
Filing: 1947-07-30
•
Granted: 1949-12-13
•
Expires: 1967-07-30
Abstract
No abstract record available.
Inventors
- 👤 Harland W Cardwell
- 👤 James W Haupt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/3023; F16H61/00; F16H61/26; F16H61/28; F16H61/30; F16H2061/308; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19293; Y10T74/19298; Y10T74/19326; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19433; Y10T74/20; Y10T74/20576; Y10T74/20582; Y10T74/2063
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |