US2998228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface heat exchangers
Assignee: Individual
•
Filing: 1957-11-12
•
Granted: 1961-08-29
•
Expires: 1977-11-12
Abstract
No abstract record available.
Inventors
- 👤 Huet Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:14
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/20; F28F1/02; F28F1/06; F28F13/00; F28F13/06; G; G21; G21C; G21C3/00; G21C3/02; G21C3/04; G21C3/06; G21C3/08; G21C5/00; G21C5/02; G21C5/06; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US243496A
Cited
US593338A
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FR964415A
Cited
US661944A
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GB190122975A
Cited
US1350320A
Cited
US1524520A
Cited
US1884777A
Cited
US2161887A
Cited
GB644491A
Cited
AT179782B
Cited
US2717320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |