US2499608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange device
Assignee: Individual
•
Filing: 1944-07-31
•
Granted: 1950-03-07
•
Expires: 1964-07-31
Abstract
No abstract record available.
Inventors
- 👤 Charles N Rink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:12
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/10; F28D7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US99998A
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US148651A
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US577287A
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GB161220A
Cited
US1704097A
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US1837442A
Cited
US2178095A
Cited
US2166808A
Cited
US2229032A
Cited
US2268360A
Cited
US2357156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |