US2650802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Countercurrent heat exchanger
Assignee: Individual
•
Filing: 1948-09-08
•
Granted: 1953-09-01
•
Expires: 1968-09-08
Abstract
No abstract record available.
Inventors
- 👤 Huet Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:46
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/02; F22D1/08; F22D1/10; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/442; Y10S165/451
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US767187A
Cited
FR432342A
Cited
US1757621A
Cited
US1884777A
Cited
US1827201A
Cited
US2167333A
Cited
US2277921A
Cited
US2444908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |