US2990696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporative heat exchanger
Assignee: Stewart Warner Corp
•
Filing: 1957-09-13
•
Granted: 1961-07-04
•
Expires: 1977-09-13
Abstract
No abstract record available.
Inventors
- 👤 John T Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:11
CPC Classifications
F; F28; F28D; F28D5/00; F24; F24F; F24F1/00; F24F1/0007; F24F1/0071; Y; Y02; Y02B; Y02B30/00; Y02B30/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2425417A
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US2537656A
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US2629587A
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US2702460A
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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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |