Patent US2853977A successfully refreshed from Google Patents.
US2853977A
Expired / Lapsed
US
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Boosters for use in hydraulic systems
Assignee: Girling Ltd
•
Filing: 1956-05-23
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Granted: 1958-09-30
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Expires: 1976-05-23
Abstract
No abstract record available.
Inventors
- 👤 Sadler Francis Antony Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:55
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/241; B60T13/242; B60T13/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2265817A
Cited
US2383682A
Cited
US2381989A
Cited
US2532462A
Cited
US2658348A
Cited
US2756845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |