US2780446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers
Assignee: Individual
•
Filing: 1954-04-28
•
Granted: 1957-02-05
•
Expires: 1974-04-28
Abstract
No abstract record available.
Inventors
- 👤 Huet Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/08; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US401685A
Cited
US2147475A
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US1734962A
Cited
US1884777A
Cited
US1787118A
Cited
US2519084A
Cited
US2578136A
Cited
US2677532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |