US2684340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfate removal from silica-alumina catalyst
Assignee: Davison Chemical Corp
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Filing: 1949-04-29
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Granted: 1954-07-20
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Expires: 1969-04-29
Abstract
No abstract record available.
Inventors
- 👤 Leon L Baral
- 👤 Jr Charles P Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:56
CPC Classifications
B; B01; B01J; B01J21/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
A METHOD OF MANUFACTURING A SILICA-ALUMINA CATALYST OF ABOUT 20-24% ALUMINA HAVING A LOW SULFATE CONTENT COMPRISING PRECIPITATING A SILICA GEL FROM AN ALKALINE SILICATE, IMPREGNATING THE PRECIPITATED GEL WITH ALUMINUM SULFATE TO AN ALUMINUM CONCENTRATION SUFFICIENT TO GIVE A GEL HAVING AN ALUMINA CONCENTRATION OF 20-24%, NEUTRALIZING THE IMPREGNATED GEL TO PRECIPITATE THE ALUMINUM AS ALUMINA, DRYING THE GEL, WASHING THE GEL TO REMOVE THE SOLUBLE SALTS, SAID WASHING INCLUDING A WASH WITH A WEAKLY ACIDIC WASH WATER AND A SEPARATE WASH WITH A WEAK AQUEOUS SOLUTION OF AMMONIA, AND DRYING THE GEL.
References Cited (Backward Citations)
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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) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |