US2863294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling air preparatory to low temperature rectification
Assignee: Union Carbide Corp
•
Filing: 1954-03-31
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Granted: 1958-12-09
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Expires: 1974-03-31
Abstract
No abstract record available.
Inventors
- 👤 George H Zenner
- 👤 Hwoschinsky Vladimir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:07
CPC Classifications
F; F25; F25J; F25J5/00; F25J3/00; F25J3/02; F25J3/04; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/905; Y10S62/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1890646A
Cited
GB276381A
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US2121733A
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US2560469A
Cited
US2492788A
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US2573747A
Cited
US2561720A
Cited
US2579421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |