US3558525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst manufacture method
Assignee: Chevron USA Inc
•
Filing: 1968-10-17
•
Granted: 1971-01-26
•
Expires: 1988-10-17
Abstract
Abstract METHOD OF CALCINING A HYDROGEL CONTAINING CATALYST COMPONENT PRECURSORS, TO IMPART IMPROVED PROPERTIES TO THE FINISHED CATALYST, COMPRISING ACCOMPLISHING THE CALCINING IN A CALCINATION VESSEL SUPPLED DURING AT LEAST A MAJOR PORTION OF THE CALCINATION TIME WITH NOT MORE THAN 3 CUBIC FEET OF PURGE GAS PER HOUR PER POUND OF CATALYST.
Inventors
- 👤 Edward D Noble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:39
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J21/00; B01J27/00; B01J27/14; B01J27/186; B01J27/188
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |