US3535228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrotreating catalyst and process
Assignee: Chevron USA Inc
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Filing: 1968-09-18
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Granted: 1970-10-20
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Expires: 1988-09-18
Abstract
No abstract record available.
Inventors
- 👤 Sigmund M Csicsery
- 👤 Thomas R Hughes
- 👤 Joseph Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:25
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/755; B01J21/00; B01J21/16; B01J23/38; B01J23/40; B01J23/44; B01J29/00; B01J29/04; B01J29/049; C; C10; C10G; C10G47/00; C10G47/02; C10G47/10; C10G47/12; C10G47/16; C10G47/20; B01J2229/00; B01J2229/30; B01J2229/42
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) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |