Patent US1557907A successfully refreshed from Google Patents.
US1557907A
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Separation of the constituents of gaseous mixtures
Assignee: Airco Inc
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Filing: 1923-05-24
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Granted: 1925-10-20
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Expires: 1943-05-24
Abstract
No abstract record available.
Inventors
- 👤 Claude C Van Nuys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:59
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/04327; F25J3/04624; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/04709; F25J3/04715; F25J2200/00; F25J2200/10; F25J2200/50; F25J2200/54
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) | 1928-10-19 | 1929-04-20 | 1929-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-10-19 | 1933-04-20 | 1933-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-10-19 | 1937-04-20 | 1937-10-20 | $7700.00 | Window Closed / Lapsed |