US2989299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cylinder and check valve therefor
Assignee: Individual
•
Filing: 1958-05-05
•
Granted: 1961-06-20
•
Expires: 1978-05-05
Abstract
No abstract record available.
Inventors
- 👤 Jack L Modrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:28
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/3415; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1273059A
Cited
US1366151A
Cited
US2527980A
Cited
US2587121A
Cited
US2624566A
Cited
US2608403A
Cited
AT182625B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |