US2999534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic heating device
Assignee: FIRELESS GAS HEATER Corp
•
Filing: 1956-08-13
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Granted: 1961-09-12
•
Expires: 1976-08-13
Abstract
No abstract record available.
Inventors
- 👤 Wagner Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:34
CPC Classifications
F; F23; F23D; F23D99/00; F23D99/002; F23D99/004; F23D2206/00; F23D2206/0057; F23D2206/0063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US613990A
Cited
US2735483A
Cited
US1575170A
Cited
DE491859C
Cited
DE659698C
Cited
DE710012C
Cited
US2803295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |