US3410339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct contact heat transfer apparatus having evaporator and condensing means
Assignee: Cornell Research Foundation Inc
•
Filing: 1964-05-18
•
Granted: 1968-11-12
•
Expires: 1984-05-18
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Wiegandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:46
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/22; F; F28; F28C; F28C3/00; F28C3/04; Y; Y10; Y10S; Y10S159/00; Y10S159/33; Y10S203/00; Y10S203/11
Claims Analysis
Total Claims: 0
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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) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |