Patent US2910972A successfully refreshed from Google Patents.
US2910972A
Expired / Lapsed
US
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Heat exchanger system
Assignee: HOT OIL HEATER Co Inc
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Filing: 1955-12-05
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Granted: 1959-11-03
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Expires: 1975-12-05
Abstract
No abstract record available.
Inventors
- 👤 Swaney Robert Casper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:22
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/36; F23; F23M; F23M20/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1934438A
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US1961723A
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Cited
US2160262A
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US2526526A
Cited
US2502071A
Cited
US2576053A
Cited
US2625915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |