US2746935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying inorganic hydrogels particles
Assignee: ExxonMobil Oil Corp
•
Filing: 1951-04-09
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Granted: 1956-05-22
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Expires: 1971-04-09
Abstract
No abstract record available.
Inventors
- 👤 Paul B Weisz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:50
CPC Classifications
B; B01; B01J; B01J21/00; B01J13/00; B01J13/0052; B01J13/0069; C; C01; C01B; C01B33/00; C01B33/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR DRYING INORGANIC HYDROGEL PARTICLES, WHICH COMPRISES PASSING A STREAM OF WARM GAS AT ATMOSPHERIC PRESSURE IN CONTACT WITH SAID PARTICLE UNTIL SHRINKAGE THEREOF IS SUBSTANTIALLY COMPLETE, AT WHICH POINT THE HYDROGEL CONTAINS APPROXIMATELY 30 PER CENT OF ITS INITIAL WATER CONTENT, EXPOSING THE SHRUNKEN PARTICLES SO OBTAINED TO AN ATMOSPHERE OF STEAM AT A PRESSURE OF AT LEAST ABOUT 250 BUT NOT MORE THAN ABOUT 3000 POUNDS PER SQUARE INCH AND A TEMPERATURE OF AT LEAST ABOUT 400* F. BUT NOT MORE THAN ABOUT 900* F. FOR A PERIOD OF AT LEAST ABOUT 1 HOUR BUT NOT MORE THAN ABOUT 6 HOURS, AND THEREAFTER COMPLETING DRYING OF THE PARTICLES TO A DESIRED MOISTURE CONTENT WITH WARM GAS AT SUBSTANTIALLY ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
124 words
A PROCESS FOR DRYING INORGANIC HYDROGEL PARTICLES, WHICH COMPRISES PASSING A STREAM OF WARM GAS AT ATMOSPHERIC PRESSURE IN CONTACT WITH SAID PARTICLE UNTIL SHRINKAGE THEREOF IS SUBSTANTIALLY COMPLETE, AT WHICH POINT THE HYDROGEL CONTAINS APPROXIMATELY 30 PER CENT OF ITS INITIAL WATER CONTENT, EXPOSING THE SHRUNKEN PARTICLES SO OBTAINED TO AN ATMOSPHERE OF STEAM AT A PRESSURE OF AT LEAST ABOUT 250 BUT NOT MORE THAN ABOUT 3000 POUNDS PER SQUARE INCH AND A TEMPERATURE OF AT LEAST ABOUT 400* F. BUT NOT MORE THAN ABOUT 900* F. FOR A PERIOD OF AT LEAST ABOUT 1 HOUR BUT NOT MORE THAN ABOUT 6 HOURS, AND THEREAFTER COMPLETING DRYING OF THE PARTICLES TO A DESIRED MOISTURE CONTENT WITH WARM GAS AT SUBSTANTIALLY ATMOSPHERIC PRESSURE.
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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) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |