US2468909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary air heater
Assignee: CNOSSEN
•
Filing: 1946-01-03
•
Granted: 1949-05-03
•
Expires: 1966-01-03
Abstract
No abstract record available.
Inventors
- 👤 Andrew J Cnossen
- 👤 Evelyn M Yeager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:57
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; F28D; F28D7/00; F28D7/10; F28D7/106; F28F9/00; F28F9/22; Y; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1801057A
Cited
US2362940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-02 | 1952-11-01 | 1953-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-02 | 1956-11-01 | 1957-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-02 | 1960-11-01 | 1961-05-03 | $7700.00 | Window Closed / Lapsed |