US2709420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cylinders having by-pass valve means
Assignee: Airco Inc
•
Filing: 1951-06-27
•
Granted: 1955-05-31
•
Expires: 1971-06-27
Abstract
No abstract record available.
Inventors
- 👤 Edward F Fullwood
- 👤 Philippi John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:38
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447; F15B15/149
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US561747A
Cited
US1880627A
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US1983051A
Cited
GB489663A
Cited
US2233521A
Cited
GB517314A
Cited
US2403325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |