Patent US3485191A successfully refreshed from Google Patents.
US3485191A
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US
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Heat generator
Assignee: JOHN R CHRISTMAN
•
Filing: 1968-02-08
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Granted: 1969-12-23
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Expires: 1988-02-08
Abstract
No abstract record available.
Inventors
- 👤 John R Christman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:28
CPC Classifications
F; F23; F23B; F23B5/00; F23C; F23C9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1002564A
Cited
US1441864A
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US1384223A
Cited
US1724505A
Cited
US2493960A
Cited
US2588138A
Cited
US2750903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |