US1819174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooled furnace and method of operating the same
Assignee: Fuller Lehigh Co
•
Filing: 1925-06-17
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Granted: 1931-08-18
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Expires: 1945-06-17
Abstract
No abstract record available.
Inventors
- 👤 David S Jacobus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:45
CPC Classifications
F; F23; F23M; F23M5/00; F23M5/08; Y; Y10; Y10S; Y10S122/00; Y10S122/01
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) | 1934-08-17 | 1935-02-16 | 1935-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-08-17 | 1939-02-16 | 1939-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-08-17 | 1943-02-16 | 1943-08-18 | $7700.00 | Window Closed / Lapsed |