US2602648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Standard Thomson Corp
•
Filing: 1949-05-18
•
Granted: 1952-07-08
•
Expires: 1969-05-18
Abstract
No abstract record available.
Inventors
- 👤 Charles S Martel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:54
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28D7/1684; F28D7/1692; F28D7/0041; F28F; F28F9/00; F28F9/22; F28F9/26; F28F2009/222; F28F2009/226
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US721310A
Cited
US1489932A
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US1875663A
Cited
US2151540A
Cited
GB479959A
Cited
US2190494A
Cited
US2347957A
Cited
GB598917A
Cited
GB591699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |