US3420144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure motor system
Assignee: Dresser Industries Inc
•
Filing: 1967-06-07
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Granted: 1969-01-07
•
Expires: 1987-06-07
Abstract
No abstract record available.
Inventors
- 👤 Frank Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:21
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/262; F01; F01B; F01B17/00; F01B17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2130618A
Cited
US2923278A
Cited
US2891514A
Cited
US3034527A
Cited
US3176590A
Cited
US3238847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |