US2638895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submerged flame burner
Assignee: Individual
•
Filing: 1947-08-18
•
Granted: 1953-05-19
•
Expires: 1967-08-18
Abstract
No abstract record available.
Inventors
- 👤 Swindin Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:05
CPC Classifications
F; F23; F23C; F23C3/00; F23C3/004; F23D; F23D14/00; F23D14/38; F23D14/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751972A
Cited
US1195403A
Cited
US710130A
Cited
US987160A
Cited
GB190807701A
Cited
US1730440A
Cited
US2204051A
Cited
US2375840A
Cited
US2515618A
Cited
US2556984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |