Patent US1836249A successfully refreshed from Google Patents.
Patent US2105533A successfully refreshed from Google Patents.
US2105533A
Expired / Lapsed
US
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Gas burning apparatus
Assignee: SELAS Co
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Filing: 1934-01-19
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Granted: 1938-01-18
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Expires: 1954-01-19
Abstract
No abstract record available.
Inventors
- 👤 Hess Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:20
CPC Classifications
F; F23; F23D; F23D99/00; F23D99/002; F23D99/004; F23D2206/00; F23D2206/0021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-01-17 | 1941-07-19 | 1942-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-01-17 | 1945-07-19 | 1946-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-01-17 | 1949-07-19 | 1950-01-18 | $7700.00 | Window Closed / Lapsed |