US2806521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace wall gas burner
Assignee: Selas Corp of America
•
Filing: 1952-06-10
•
Granted: 1957-09-17
•
Expires: 1972-06-10
Abstract
No abstract record available.
Inventors
- 👤 Blaha Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:48
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/12; F23D14/125
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE595514C
Cited
US882545A
Cited
GB191208480A
Cited
US1910020A
Cited
US2070859A
Cited
US2398398A
Cited
US2474313A
Cited
US2583736A
Cited
US2499218A
Cited
US2543688A
Cited
US2561793A
Cited
US2669300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |