US2178833A
Expired / Lapsed
US
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Apparatus for producing hydrogennitrogen mixtures
Assignee: Union Carbide and Carbon Research Laboratories Inc
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Filing: 1936-07-30
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Granted: 1939-11-07
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Expires: 1956-07-30
Abstract
No abstract record available.
Inventors
- 👤 Erasmus Hendrik De Wet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:17
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; C01B2203/04; C01B2203/0415; C01B2203/0465; C01B2203/047; C01B2203/08; C01B2203/0805; C01B2203/0838; C01B2203/0844; C01B2203/0872; C01B2203/0883; C01B2203/12; C01B2203/1276; C01B2203/14; C01B2203/142; C01B2203/16; C01B2203/1614; C01B2203/1619; C01B2203/80; C01B2203/82
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) | 1942-11-06 | 1943-05-08 | 1943-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-06 | 1947-05-08 | 1947-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-06 | 1951-05-08 | 1951-11-07 | $7700.00 | Window Closed / Lapsed |