Patent US1409967A successfully refreshed from Google Patents.
US1409967A
Expired / Lapsed
US
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Heat exchanger
Assignee: Individual
•
Filing: 1920-10-29
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Granted: 1922-03-21
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Expires: 1940-10-29
Abstract
No abstract record available.
Inventors
- 👤 Prat Emile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:14
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28F; F28F3/00; F28F2210/00; F28F2250/00; F28F2250/10; F28F2250/102; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/387; Y10S165/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1925-03-20 | 1925-09-19 | 1926-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-03-20 | 1929-09-19 | 1930-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-03-20 | 1933-09-19 | 1934-03-21 | $7700.00 | Window Closed / Lapsed |