US3038865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activated aluminum catalyst carriers and catalysts prepared therewith
Assignee: Individual
•
Filing: 1959-01-28
•
Granted: 1962-06-12
•
Expires: 1979-01-28
Abstract
No abstract record available.
Inventors
- 👤 Johan P Abrahams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:54
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J21/00; B01J21/02; B01J21/04; B01J35/61; B01J35/615; B01J35/63; B01J35/633; B01J35/64; B01J35/647
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A METHOD OF PRODUCING AN IMPROVED CATALYST CARRIER WHICH COMPRISES REMOVING AT LEAST A MAJOR PORTION OF THE PORES HAVING A DIAMETER SMALLER THAN 70 ANGSTROMS FROM SMALL PIECES OF ACTIVATED ALUMINA WHILE AVOIDING MATERIAL REDUCTION IN THEIR TOTAL PORE VOLUME BY LEACHING SAID PIECES WITH AN ACID UNTIL FROM ABOUT 3% TO 20% OF THE ALUMINA IS REMOVED AND CALCINING THEM AT ABOUT 550*-850*C. FOR AT LEAST A TIME WITHIN THE RANGE OF FROM 30 MINUTES AT 800-850*C. TO 3 HOURS AT 550*C.
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) | 1965-06-11 | 1965-12-11 | 1966-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-11 | 1969-12-11 | 1970-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-11 | 1973-12-11 | 1974-06-12 | $7700.00 | Window Closed / Lapsed |