US2625215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas burner and secondary air feed means
Assignee: Individual
•
Filing: 1948-12-13
•
Granted: 1953-01-13
•
Expires: 1968-12-13
Abstract
No abstract record available.
Inventors
- 👤 Leo E Hart
- 👤 Robert C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:53
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/20; F23D14/22; F23C; F23C6/00; F23C6/04; F23C6/045; F23D14/46; F23D14/62; F23D14/64; F23D14/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US472198A
Cited
CH26661A
Cited
US1251084A
Cited
US1352351A
Cited
US1385509A
Cited
GB265041A
Cited
US2011283A
Cited
US1956857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |