US1619909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of the constituents of ternary gaseous mixtures
Assignee: Airco Inc
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Filing: 1925-10-15
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Granted: 1927-03-08
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Expires: 1945-10-15
Abstract
No abstract record available.
Inventors
- 👤 Wilkinson Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:40
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/04666; F25J3/04672; F25J3/04624; F25J2200/00; F25J2200/04; 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) | 1930-03-07 | 1930-09-06 | 1931-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-03-07 | 1934-09-06 | 1935-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-03-07 | 1938-09-06 | 1939-03-08 | $7700.00 | Window Closed / Lapsed |