Patent US2022165A successfully refreshed from Google Patents.
US2022165A
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US
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Method of separating and purifying hydrogen
Assignee: Individual
•
Filing: 1934-05-09
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Granted: 1935-11-26
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Expires: 1954-05-09
Abstract
No abstract record available.
Inventors
- 👤 Lee S Twomey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:19
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0204; F25J3/0223; F25J3/0228; F25J3/0252; F25J2210/00; F25J2210/42; F25J2270/00; F25J2270/90; F25J2270/904
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) | 1938-11-25 | 1939-05-27 | 1939-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-25 | 1943-05-27 | 1943-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-25 | 1947-05-27 | 1947-11-26 | $7700.00 | Window Closed / Lapsed |