US2856962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic rectifying device
Assignee: Individual
•
Filing: 1956-02-09
•
Granted: 1958-10-21
•
Expires: 1976-02-09
Abstract
No abstract record available.
Inventors
- 👤 Walter P Christoph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:56
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; F; F15; F15D; F15D1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1419876A
Cited
US1559155A
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US2127501A
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US2264109A
Cited
US2670011A
Cited
US2764183A
Cited
US2694296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |