US2268979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas heater
Assignee: Maxim Silencer Co
•
Filing: 1940-04-05
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Granted: 1942-01-06
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Expires: 1960-04-05
Abstract
No abstract record available.
Inventors
- 👤 William R Williamson
- 👤 Jr Felix Saco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:43
CPC Classifications
F; F01; F01N; F01N5/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S165/00; Y10S165/092; Y10S165/109; Y10S165/11; Y10S165/111; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6525; Y10T137/8593; Y10T137/87265; Y10T137/8741
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-01-05 | 1945-07-07 | 1946-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-05 | 1949-07-07 | 1950-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-05 | 1953-07-07 | 1954-01-06 | $7700.00 | Window Closed / Lapsed |