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Patent US2801552A successfully refreshed from Google Patents.
US2801552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epicyclic gearboxes
Assignee: British Thomson Houston Co Ltd
•
Filing: 1954-03-12
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Granted: 1957-08-06
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Expires: 1974-03-12
Abstract
No abstract record available.
Inventors
- 👤 Stubbings John Eric
- 👤 Hirst Archie John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:02
CPC Classifications
F; F16; F16H; F16H1/00; F16H1/28; F16H1/2809; F16H1/2818; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19633
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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |