US2490823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic-pneumatic system
Assignee: Individual
•
Filing: 1946-10-14
•
Granted: 1949-12-13
•
Expires: 1966-10-14
Abstract
No abstract record available.
Inventors
- 👤 Howard H Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:21
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B2211/00; F15B2211/20; F15B2211/21; F15B2211/216; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/41; F15B2211/411; F15B2211/415; F15B2211/41527; F15B2211/42; F15B2211/421; F15B2211/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US706688A
Cited
US2208451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |