US2135694A
Expired / Lapsed
US
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Process for the production of hydrogen
Assignee: Solvay Process Co
•
Filing: 1930-09-25
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Granted: 1938-11-08
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Expires: 1950-09-25
Abstract
No abstract record available.
Inventors
- 👤 Dwight C Bardwell
- 👤 Porter Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:05
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/36; C01B3/025; C01B3/48; C01B2203/00; C01B2203/02; C01B2203/0205; C01B2203/0227; C01B2203/0244; C01B2203/0283; C01B2203/06; C01B2203/068; C01B2203/08; C01B2203/0805; C01B2203/0838; C01B2203/0844; C01B2203/12; C01B2203/1205; C01B2203/1211; C01B2203/1235; C01B2203/1241; C01B2203/14; C01B2203/142; C01B2203/80; C01B2203/82; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
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) | 1941-11-07 | 1942-05-09 | 1942-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-11-07 | 1946-05-09 | 1946-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-11-07 | 1950-05-09 | 1950-11-08 | $7700.00 | Window Closed / Lapsed |