US2579123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivation of silica-alumina catalysts by silica addition
Assignee: Gulf Research and Development Co
•
Filing: 1948-09-22
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Granted: 1951-12-18
•
Expires: 1968-09-22
Abstract
No abstract record available.
Inventors
- 👤 William A Pardee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:05
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
THE METHOD OF REACTIVATING A PERMANENTLY DEACATIVED SILICA - ALUMINA CRACKING CATALYST WHICH CONSISTS IN IMPREGNATING THE SURFACE OF SAID CATALYST WITH A FLUID COMPOUND YIELDING SILICA UPON DECOMPOSITION, AND DECOMPOSING SAID IMPREGNATED COMPOUND.
Claim 2
Independent Claim
34 words
THE METHOD OF REACTIVATING A PERMANENTLY DEACATIVED SILICA - ALUMINA CRACKING CATALYST WHICH CONSISTS IN IMPREGNATING THE SURFACE OF SAID CATALYST WITH A FLUID COMPOUND YIELDING SILICA UPON DECOMPOSITION, AND DECOMPOSING SAID IMPREGNATED COMPOUND.
References Cited (Backward Citations)
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Cited
US2330174A
Cited
US2346844A
Cited
US2439852A
Cited
US2428741A
Cited
US2480627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |