US2651258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field-sensitive hydraulic apparatus
Assignee: Individual
•
Filing: 1948-09-10
•
Granted: 1953-09-08
•
Expires: 1968-09-10
Abstract
No abstract record available.
Inventors
- 👤 Pierce Firth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:20
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/14; H01J7/18; H01J7/186; Y; Y10; Y10T; Y10T137/00; Y10T137/4456; Y10T137/4643
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US601957A
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US1047329A
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US1069408A
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US1674914A
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US1975965A
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US2276895A
Cited
US2279243A
Cited
US2405127A
Cited
US2505049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |