US3435614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained hydraulic valve actuator
Assignee: HOWARD L LEDEEN
•
Filing: 1967-01-23
•
Granted: 1969-04-01
•
Expires: 1987-01-23
Abstract
No abstract record available.
Inventors
- 👤 Howard L Ledeen
- 👤 Elmer W Childress
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:14
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; F15B9/00; F15B9/14; F16; F16K; F16K31/00; Y; Y10; Y10S; Y10S60/00; Y10S60/911; Y10S60/916
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2748569A
Cited
US2938347A
Cited
US2942581A
Cited
US2984985A
Cited
US3120103A
Cited
US3084513A
Cited
US3360930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |