US2997854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for separating gaseous mixtures
Assignee: Air Products Inc
•
Filing: 1957-08-16
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Granted: 1961-08-29
•
Expires: 1977-08-16
Abstract
No abstract record available.
Inventors
- 👤 Clarence J Schilling
- 👤 Claitor Lilburn Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:37
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04763; F25J3/04866; F25J3/04896; F25J3/04151; F25J3/04242; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/04406; F25J3/04412; F25J2205/00; F25J2205/02; F25J2205/04; F25J2205/24; F25J2205/30; F25J2205/60; F25J2220/00; F25J2220/40; F25J2240/00; F25J2240/60; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/939
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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |