Patent US2012080A successfully refreshed from Google Patents.
US2012080A
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Method of and apparatus for separating and purifying helium from a gaseous mixture
Assignee: Individual
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Filing: 1933-11-15
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Granted: 1935-08-20
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Expires: 1953-11-15
Abstract
No abstract record available.
Inventors
- 👤 Baufre William Lane De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:38
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/08; F25J3/02; F25J3/0204; F25J3/0209; F25J3/0228; F25J3/0257; F25J3/028; F25J3/029; F25J2200/00; F25J2200/02; F25J2200/50; F25J2200/76; F25J2200/80; F25J2215/00; F25J2215/30; F25J2270/00; F25J2270/02; F25J2270/04; F25J2270/42; F25J2280/00; F25J2280/30
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) | 1938-08-19 | 1939-02-18 | 1939-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-08-19 | 1943-02-18 | 1943-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-08-19 | 1947-02-18 | 1947-08-20 | $7700.00 | Window Closed / Lapsed |