Patent US3494029A successfully refreshed from Google Patents.
Patent US2149740A successfully refreshed from Google Patents.
US2149740A
Expired / Lapsed
US
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Draft regulator for furnaces
Assignee: Iron Fireman Manufacturing Co
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Filing: 1934-07-23
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Granted: 1939-03-07
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Expires: 1954-07-23
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:55
CPC Classifications
F; F23; F23L; F23L1/00; F23L1/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781
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) | 1942-03-06 | 1942-09-05 | 1943-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-03-06 | 1946-09-05 | 1947-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-03-06 | 1950-09-05 | 1951-03-07 | $7700.00 | Window Closed / Lapsed |