Patent US3412622A successfully refreshed from Google Patents.
US3412622A
Expired / Lapsed
US
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Variable-ratio frictional drives
Assignee: English Electric Co Ltd
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Filing: 1967-02-21
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Granted: 1968-11-26
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Expires: 1987-02-21
Abstract
No abstract record available.
Inventors
- 👤 Rhodes Richard Nelson
- 👤 Schofield Clifford Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:47
CPC Classifications
F; F16; F16H; F16H15/00; F16H15/02; F16H15/04; F16H15/06; F16H15/32; F16H15/36; F16H15/38; F16H13/00; F16H13/10; F16H13/14; F16H15/48; F16H15/50; F16H15/52; F16H2015/383
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) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |