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Patent US2328828A successfully refreshed from Google Patents.
US2328828A
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Hydrogen purification process
Assignee: Standard Oil Co
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Filing: 1941-01-31
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Granted: 1943-09-07
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Expires: 1961-01-31
Abstract
No abstract record available.
Inventors
- 👤 Robert F Marschner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:16
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/52; C01B3/54; C01B2203/00; C01B2203/04; C01B2203/0415; C01B2203/0465; C01B2203/048; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/90
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) | 1946-09-06 | 1947-03-08 | 1947-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-09-06 | 1951-03-08 | 1951-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-09-06 | 1955-03-08 | 1955-09-07 | $7700.00 | Window Closed / Lapsed |