US2564776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion of a frozen and thawed hydrogel
Assignee: ExxonMobil Oil Corp
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Filing: 1949-07-13
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Granted: 1951-08-21
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Expires: 1969-07-13
Abstract
No abstract record available.
Inventors
- 👤 Ernest A Bodkin
- 👤 John W Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:17
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J2/00; B01J2/02; B01J2/06; B01J2/08; C; C01; C01B; C01B33/00; C01B33/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD FOR PREPARING HARD GRANULES OF INORGANIC OXIDE GEL CONTAINING A MAJOR PROPORTION OF SILICA, WHICH COMPRISES FORMING A HYDROGEL COMPRISING A MAJOR PROPORTION A SILICA BY ACIDIFICATION OF AN ALKALI METAL SILICATE SOLUTION, WHEREBY ZEOLITIC ALKALI METAL IONS ARE UNAVOIDABLY INCORPORATED INTO THE SILICA-CONTAINING HYDROGEL, FREEZING SAID HYDROGEL AT A TEMPERATURE OF ABOUT 0* F. TO ACHIEVE MAXIMUM WATER REMOVAL THEREFROM, THAWING THE FROZEN HYDROGEL TO PRODUCE A MASS OF SHRUNKEN HYDROGEL GRANULES AND AN AQUEOUS LIQUID, SEPARATING SAID AQUEOUS LIQUID FROM SAID HYDROGEL GRANULES, EXTRUDING SAID GRANULES THROUGH A DIE AND DRYING THE EXTRUDED HYDROGEL.
Claim 2
Independent Claim
98 words
A METHOD FOR PREPARING HARD GRANULES OF INORGANIC OXIDE GEL CONTAINING A MAJOR PROPORTION OF SILICA, WHICH COMPRISES FORMING A HYDROGEL COMPRISING A MAJOR PROPORTION A SILICA BY ACIDIFICATION OF AN ALKALI METAL SILICATE SOLUTION, WHEREBY ZEOLITIC ALKALI METAL IONS ARE UNAVOIDABLY INCORPORATED INTO THE SILICA-CONTAINING HYDROGEL, FREEZING SAID HYDROGEL AT A TEMPERATURE OF ABOUT 0* F. TO ACHIEVE MAXIMUM WATER REMOVAL THEREFROM, THAWING THE FROZEN HYDROGEL TO PRODUCE A MASS OF SHRUNKEN HYDROGEL GRANULES AND AN AQUEOUS LIQUID, SEPARATING SAID AQUEOUS LIQUID FROM SAID HYDROGEL GRANULES, EXTRUDING SAID GRANULES THROUGH A DIE AND DRYING THE EXTRUDED HYDROGEL.
References Cited (Backward Citations)
US2480669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |