US1807897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of obtaining substantially pure hydrogen
Assignee: Individual
•
Filing: 1925-06-19
•
Granted: 1931-06-02
•
Expires: 1945-06-19
Abstract
No abstract record available.
Inventors
- 👤 Cicali Giovanni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0261; C; C01; C01B; C01B3/00; C01B3/50; C01B3/506; C01B3/52; F25J3/0204; F25J3/0219; F25J3/0223; F25J3/0252; C01B2203/00; C01B2203/04; C01B2203/0415; C01B2203/0465; C01B2203/047; F25J2200/00; F25J2200/80; F25J2210/00; F25J2210/14; Y; Y02; Y02P; Y02P20/00; Y02P20/151; Y10; Y10S; Y10S62/00; Y10S62/931; Y10S62/934
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) | 1934-06-01 | 1934-12-01 | 1935-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-06-01 | 1938-12-01 | 1939-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-06-01 | 1942-12-01 | 1943-06-02 | $7700.00 | Window Closed / Lapsed |