US2646971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange unit
Assignee: Individual
•
Filing: 1950-06-17
•
Granted: 1953-07-28
•
Expires: 1970-06-17
Abstract
No abstract record available.
Inventors
- 👤 Raskin Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:16
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; F25; F25B; F25B39/00; F25B39/02; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49364; Y10T29/49373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US473176A
Cited
US1888900A
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US1880877A
Cited
US2205984A
Cited
US2306526A
Cited
US2281299A
Cited
US2441463A
Cited
US2524655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |