US2650801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1949-10-11
•
Granted: 1953-09-01
•
Expires: 1969-10-11
Abstract
No abstract record available.
Inventors
- 👤 Michael B Collito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:42
CPC Classifications
F; F25; F25D; F25D31/00; F25D31/002; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/442
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US566243A
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US1188485A
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US1098476A
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US2151206A
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US2340926A
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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 |