US3001779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air heater
Assignee: Selas Corp of America
•
Filing: 1958-06-06
•
Granted: 1961-09-26
•
Expires: 1978-06-06
Abstract
No abstract record available.
Inventors
- 👤 Williams John Roger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:34
CPC Classifications
F; F23; F23D; F23D11/00; F23D14/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US646218A
Cited
US1933020A
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US1995003A
Cited
US2445466A
Cited
US2403431A
Cited
US2549347A
Cited
US2538888A
Cited
US2851337A
Cited
US2835322A
Cited
US2832580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-25 | 1965-03-27 | 1965-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-25 | 1969-03-27 | 1969-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-25 | 1973-03-27 | 1973-09-26 | $7700.00 | Window Closed / Lapsed |