US2454480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air control device
Assignee: Individual
•
Filing: 1946-05-21
•
Granted: 1948-11-23
•
Expires: 1966-05-21
Abstract
No abstract record available.
Inventors
- 👤 Rossman David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:46
CPC Classifications
F; F02; F02M; F02M21/00; F02M2700/00; F02M2700/13; F02M2700/1305; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7748; Y10T137/7749; Y10T137/7771; Y10T137/7837; Y10T137/7869
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US501437A
Cited
US516328A
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US920716A
Cited
US1001510A
Cited
US1060142A
Cited
US1063933A
Cited
US1640615A
Cited
US1764181A
Cited
US2165649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |