US2747568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-heating fireplace structure
Assignee: Individual
•
Filing: 1952-03-18
•
Granted: 1956-05-29
•
Expires: 1972-03-18
Abstract
No abstract record available.
Inventors
- 👤 Raymond R Dupler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/02; F24C15/04; F24B; F24B1/00; F24B1/18; F24B1/1808
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1864333A
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US2013237A
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US2360611A
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US2438035A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |