Patent US3489254A successfully refreshed from Google Patents.
US3489254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque converter clutch with centrifugal valve
Assignee: Perkins Ltd
•
Filing: 1968-01-31
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Granted: 1970-01-13
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Expires: 1988-01-31
Abstract
No abstract record available.
Inventors
- 👤 Alan W Sparrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:51
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/14; F16H61/141; F16H61/142; F16H45/00; F16H45/02; F16H2045/0273; F16H2045/0278; Y; Y10; Y10T; Y10T137/00; Y10T137/0971; Y10T137/108; Y10T137/1153
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2860660A
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US2967022A
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US3064669A
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US3264884A
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US3262523A
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US3390594A
Cited
US3390831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |