US2672031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionation of gas mixtures
Assignee: Air Products Inc
•
Filing: 1950-10-10
•
Granted: 1954-03-16
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Expires: 1970-10-10
Abstract
No abstract record available.
Inventors
- 👤 Clarence J Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:46
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J3/04187; F25J3/0423; F25J3/04406; F25J3/04412; F25J2200/00; F25J2200/50; F25J2200/54; F25J2270/00; F25J2270/02; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1426461A
Cited
US1626345A
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US1784120A
Cited
US1970299A
Cited
FR703862A
Cited
US2009084A
Cited
US2035516A
Cited
US2527301A
Cited
US2386297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |