US1869825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of pure hydrogen
Assignee: Standard IG Co
•
Filing: 1928-05-14
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Granted: 1932-08-02
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Expires: 1948-05-14
Abstract
No abstract record available.
Inventors
- 👤 Ritter Gerhard
- 👤 Ufer Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:11
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/506; C01B2203/00; C01B2203/04; C01B2203/0465; C01B2203/048
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) | 1935-08-02 | 1936-02-01 | 1936-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-02 | 1940-02-01 | 1940-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-02 | 1944-02-01 | 1944-08-02 | $7700.00 | Window Closed / Lapsed |