Patent US3159279A successfully refreshed from Google Patents.
Patent US3452737A successfully refreshed from Google Patents.
US3452737A
Expired / Lapsed
US
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Fireplace control and heat exchange unit
Assignee: ROBERT H SERATT
•
Filing: 1967-06-09
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Granted: 1969-07-01
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Expires: 1987-06-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph Eugene Pellegrino
- 👤 Robert H Seratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:26
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/188; F24B1/1885; F24B1/1886
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2048675A
Cited
US2369044A
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GB556543A
Cited
US2359197A
Cited
US2743720A
Cited
US2828078A
Cited
US3001521A
Cited
US3240206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |