Patent US3493041A successfully refreshed from Google Patents.
US3493041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-liquid finned heat exchanger
Assignee: Individual
•
Filing: 1968-01-02
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Granted: 1970-02-03
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Expires: 1988-01-02
Abstract
No abstract record available.
Inventors
- 👤 Avinoam Hourwitz
- 👤 Boleslaw Houchman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:42
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28D; F28D7/00; F28D7/10; F28D7/106; F28F1/40; F28F13/00; F28F13/06; F28F13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1307393A
Cited
US1983466A
Cited
GB547263A
Cited
US2445115A
Cited
CH268479A
Cited
US2740803A
Cited
FR1274618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |