US2940269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for separating gaseous mixtures by rectification
Assignee: Union Carbide Corp
•
Filing: 1956-01-04
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Granted: 1960-06-14
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Expires: 1976-01-04
Abstract
No abstract record available.
Inventors
- 👤 Richard J Frainier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:54
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04254; F25J3/04151; F25J3/04242; F25J3/04284; F25J3/0429; F25J3/04303; F25J3/04406; F25J3/04412; F25J3/04763; F25J3/04866; F25J3/04896; F25J3/04933; F25J2200/00; F25J2200/90; F25J2200/92; F25J2205/00; F25J2205/24; F25J2205/30; F25J2205/60; F25J2210/00; F25J2210/50; F25J2240/00; F25J2240/40; F25J2240/44; F25J2245/00; F25J2245/40; F25J2245/50; Y; Y10; Y10S; Y10S62/00; Y10S62/912; Y10S62/913
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |