US2977889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure power converter
Assignee: Individual
•
Filing: 1957-02-11
•
Granted: 1961-04-04
•
Expires: 1977-02-11
Abstract
No abstract record available.
Inventors
- 👤 James C Fisk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:36
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/18; F04C14/20; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/3448
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1276372A
Cited
US2232599A
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GB566126A
Cited
US2439448A
Cited
US2607298A
Cited
US2434590A
Cited
US2691868A
Cited
US2633710A
Cited
US2629332A
Cited
US2687012A
Cited
US2628566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |