Patent US2491547A successfully refreshed from Google Patents.
US2491547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stoker
Assignee: American Engineering Co Ltd
•
Filing: 1946-07-20
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Granted: 1949-12-20
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Expires: 1966-07-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Bennett
- 👤 Allen W Thorson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:39
CPC Classifications
F; F23; F23K; F23K3/00; F23K3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US608065A
Cited
US984197A
Cited
US1051890A
Cited
US1120254A
Cited
US1198841A
Cited
US1878524A
Cited
US2057622A
Cited
US2302173A
Cited
GB554223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |