US2532740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel burner provided with combustion gas recirculating means
Assignee: Individual
•
Filing: 1948-02-10
•
Granted: 1950-12-05
•
Expires: 1968-02-10
Abstract
No abstract record available.
Inventors
- 👤 William H Speer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:37
CPC Classifications
F; F23; F23C; F23C9/00; F23C9/006; F23D; F23D11/00; F23D11/36; F23D11/40; F23D11/402
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US269720A
Cited
US2224544A
Cited
US657228A
Cited
US1614359A
Cited
US1658462A
Cited
GB371056A
Cited
US2200278A
Cited
US2110209A
Cited
US2207010A
Cited
US2357622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |