US2979124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air heater fuel control system
Assignee: American Air Filter Co Inc
•
Filing: 1958-09-29
•
Granted: 1961-04-11
•
Expires: 1978-09-29
Abstract
No abstract record available.
Inventors
- 👤 Harold L Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:29
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F23; F23D; F23D11/00; F23D11/24; F23D11/26; F23D11/28; F23N; F23N5/00; F23N5/20; F24H15/00; F24H15/20; F24H15/208; F24H15/30; F24H15/305; F24H15/31; F24H15/355; F24H15/36; F24H15/40; F24H15/407; F23N2227/00; F23N2227/04; F23N2233/00; F23N2233/06; F23N2239/00; F23N2239/06; F23N5/02; F23N5/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |