US3415759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hydrogenation catalysts
Assignee: Shell USA Inc
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Filing: 1964-03-11
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Granted: 1968-12-10
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Expires: 1984-03-11
Abstract
No abstract record available.
Inventors
- 👤 Johnson Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:58
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/12; B01J31/14; B01J31/143; B01J31/04; B01J31/16; B01J31/1616; C; C08; C08C; C08C19/00; C08C19/02; C08F; C08F8/00; C08F8/04; B01J2231/00; B01J2231/60; B01J2231/64; B01J2231/641; B01J2231/646; B01J2531/00; B01J2531/60; B01J2531/64; B01J2531/66; B01J2531/70; B01J2531/72; B01J2531/80; B01J2531/84; B01J2531/845; B01J2531/847; Y; Y10; Y10S; Y10S502/00; Y10S502/506
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |