Patent US3772639A successfully refreshed from Google Patents.
US2508564A
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US
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Air controlled shifting mechanism
Assignee: CARDWELL Mfg CO Inc
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Filing: 1947-07-30
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Granted: 1950-05-23
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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 15:26
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; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19433; Y10T74/20; Y10T74/20012; Y10T74/20018; Y10T74/20024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US68994A
Cited
US859737A
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US1010054A
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US1141589A
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FR800878A
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US2110994A
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US2242542A
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US2403328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |