US2287137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for eliminating impurities when separating gas mixtures
Assignee: Linde Air Products Co
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Filing: 1940-11-15
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Granted: 1942-06-23
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Expires: 1960-11-15
Abstract
No abstract record available.
Inventors
- 👤 Harold T Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:30
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J3/04242; F25J3/044; F25J3/04406; F25J3/04412; F25J2200/00; F25J2200/38; F25J2200/70; F25J2220/00; F25J2220/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-06-22 | 1945-12-22 | 1946-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-06-22 | 1949-12-22 | 1950-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-06-22 | 1953-12-22 | 1954-06-23 | $7700.00 | Window Closed / Lapsed |