US3094384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling properties of porous metal oxides
Assignee: Standard Oil Co
•
Filing: 1958-09-29
•
Granted: 1963-06-18
•
Expires: 1978-09-29
Abstract
No abstract record available.
Inventors
- 👤 Ralph J Bertolacini
- 👤 Harry M Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:42
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J21/00; B01J21/02; B01J21/04; C01B33/00; C01B33/113; C01B33/12; C01B33/126; C01B35/08; C01B35/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A METHOD OF PREPARING ALUMINA OF DECREASED PORE SIZE AND SURFACE AREA, WHICH METHOD COMPRISES SUBJECTING AN ALUMINA HYDROGEL TO PRESSURE IN EXCESS OF ABOUT 50,000 P,S.I. FOR A PERIOD IN THE RANGE OF ABOUT 0.1 TO 100 HOURS, DEPRESSURING, AND THEREAFTER DRYING AND CALCINING.
Claim 2
Independent Claim
42 words
A METHOD OF PREPARING SILICA OF DECREASED PORT DIAMETER, WHICH METHOD COMPRISES SUBJECTING A SILICA HYDROSOL TO PRESSURE IN EXCESS OF ABOUT 50,000 P.S.I. FOR A PERIOD IN THE RANGE OF ABIUT 0.1 TO 100 HOURS, DEPRESSURING AND THEREAFTER DRYING AND CALCINING.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |