Patent US1673409A successfully refreshed from Google Patents.
US1673409A
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US
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Heat-interchange apparatus
Assignee: Winchester Repeating Arms Co
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Filing: 1926-03-12
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Granted: 1928-06-12
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Expires: 1946-03-12
Abstract
No abstract record available.
Inventors
- 👤 George H Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:03
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/026; F28F9/0265; F28D; F28D7/00; F28D7/0041; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/442; Y10S165/448
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) | 1931-06-12 | 1931-12-12 | 1932-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-06-12 | 1935-12-12 | 1936-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-06-12 | 1939-12-12 | 1940-06-12 | $7700.00 | Window Closed / Lapsed |