Patent US3469663A successfully refreshed from Google Patents.
US3469663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant speed clutch and torque converter transmission
Assignee: Twin Disc Inc
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Filing: 1968-05-02
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Granted: 1969-09-30
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Expires: 1988-05-02
Abstract
No abstract record available.
Inventors
- 👤 Conrad R Hilpert
- 👤 Roger G De Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:50
CPC Classifications
F; F16; F16H; F16H45/00; F16K; F16K11/00; F16K11/10; F16K11/20; F16H2045/002; Y; Y10; Y10T; Y10T137/00; Y10T137/0971; Y10T137/1007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |