Patent US6658325B2 successfully refreshed from Google Patents.
US1638005A
Expired / Lapsed
US
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Process of separation of the elements of air or of other gaseous mixtures by liquefaction and rectification
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1922-07-21
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Granted: 1927-08-02
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Expires: 1942-07-21
Abstract
No abstract record available.
Inventors
- 👤 Rouge Jean Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:16
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04642; F25J3/04648; F25J3/04248; F25J3/04333; F25J3/04369; F25J3/044; F25J3/04624; F25J3/04654; F25J3/0466; F25J3/04709; F25J2200/00; F25J2200/04; F25J2200/70; F25J2235/00; F25J2235/02; F25J2245/00; F25J2245/50; F25J2250/00; F25J2250/20; F25J2250/30; F25J2250/50; F25J2250/58
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) | 1930-08-01 | 1931-01-31 | 1931-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-08-01 | 1935-01-31 | 1935-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-08-01 | 1939-01-31 | 1939-08-02 | $7700.00 | Window Closed / Lapsed |