Patent US3449078A successfully refreshed from Google Patents.
US3449078A
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US
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Process for the preparation of hydrogen
Assignee: Shell USA Inc
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Filing: 1967-02-24
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Granted: 1969-06-10
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Expires: 1987-02-24
Abstract
No abstract record available.
Inventors
- 👤 Willem C J Quik
- 👤 Pieter A Van Weeren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:55
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/889; B01J23/8898; B01J23/16; B01J23/32; B01J23/36; B01J23/38; B01J23/54; B01J23/66; B01J23/68; B01J23/688; B01J23/8896; B01J23/90; B01J27/00; B01J27/02; B01J27/04; C; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/38; C01B3/384; C01B3/40; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C4/20; C10; C10G; C10G11/00; C10G11/02; C01B2203/00; C01B2203/10; C01B2203/1041; C01B2203/1047; C01B2203/1052; C01B2203/1076; C01B2203/1082; C01B2203/1094; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/32; C07C2523/36; C07C2523/38; C07C2523/48; C07C2523/50; C07C2523/52; C07C2523/70; C07C2523/74; C07C2523/75; C07C2523/755; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/584
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |