US2922497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic locking device
Assignee: Hydro Aire Inc
•
Filing: 1956-11-19
•
Granted: 1960-01-26
•
Expires: 1976-11-19
Abstract
No abstract record available.
Inventors
- 👤 Porter Percy Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:27
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/022; A47C1/024; A47C1/0244
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1685750A
Cited
US2329145A
Cited
US2559047A
Cited
US2507601A
Cited
US2592656A
Cited
GB691367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-25 | 1963-07-27 | 1964-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-25 | 1967-07-27 | 1968-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-25 | 1971-07-27 | 1972-01-26 | $7700.00 | Window Closed / Lapsed |