Patent EP0107874A1 successfully refreshed from Google Patents.
US2680100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silica-magnesia catalyst
Assignee: Davison Chemical Corp
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Filing: 1951-03-06
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Granted: 1954-06-01
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Expires: 1971-03-06
Abstract
No abstract record available.
Inventors
- 👤 Ahlberg Jacob Elston
- 👤 Leon L Baral
- 👤 Thomas O Tongue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:16
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
A METHOD OF PREPARING A SILICA-MAGNESIA CATALYST WHICH COMPRISES FORMING A SILICA-MAGNESIA HYDROGEL, WASHING THE SILICA-MAGNESIA HYDROGEL TO REMOVE SOLUBLE SALTS THEREFROM, DRYING THE HYDROGEL TO FORM AN IRREVERSIBLE GEL, HEAT TREATING THE GEL SUBSEQUENT TO DRYING WITH LIQUID WATER AT 100*-212* F., AND THEN ACTIVATING THE TREATED CATALYST.
References Cited (Backward Citations)
US1900859A
Cited
US2319185A
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US2378155A
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US2456721A
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US2565627A
Cited
US2570063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |