Patent US2769788A successfully refreshed from Google Patents.
US2769788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making weighted polymer beads
Assignee: Dow Chemical Co
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Filing: 1952-10-01
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Granted: 1956-11-06
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Expires: 1972-10-01
Abstract
No abstract record available.
Inventors
- 👤 Paul M Craven
- 👤 James A Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:23
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; B; B01; B01J; B01J47/00; B01J47/016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A METHOD WHICH COMPRISES TREATING A FINELY DIVIDED SOLID MATERIAL, WHICH HAS AN ABSOLUTE DENSITY OF AT LEAST 2.5 AND IS OF NOT LARGER THAN 80 MESH PARTICLE SIZE AND WHICH IS INSOLUBLE IN AND CHEMICALLY INERT TO VINYL AROMATIC COMPOUNDS AND THEIR POLYMERS, WITH AN AGENT WHICH, WHEN APPLIED TO WATER-WETTABLE BY ORRENDERS THE LATTER REPELLENT TO WATER AND WETTABLE BY ORGANIC LIQUIDS, ADMIXING THE THUS-TREATED SOLID MATERIAL WITH AT LEAST ONE LIQUID VINYL AROMATIC HYDROCARBON TO FORM A SLURRY OF THE SOLID PARTICLES AND THE LIQUID VINYL AROMATIC HYDROCARBON, AGITATING THE SLURRY TOGETHER WITH A LARGER VOLUME OF AN AQUEOUS SALT SOLUTION THAT IS NONSOLVENT FOR SAID SLURRY AND HAS AT LEAST 0.5 PERCENT BY WEIGHT OF A STRONGLY IONIZED INORGANIC SALT DISSOLVED THEREIN, TO FORM A SUSPENSION OF DROPLETS OF SAID SLURRY IN THE AQUEOUS SALT SOLUTION WHILE HEATING THE AGITATED MIXTURE TO CAUSE POLYMERIZATION OF THE VINYL AROMATIC HYDROCARBON, WHEREBY THERE ARE FORMED SUBSTANTIALLY SPERICAL SOLID BEADS OF THE POLYMERIZED VINYL AROMATIC HYDROCARBON HAVING THE FINELY DIVIDED SOLIDE STARTING MATERIAL EMBEDDED THEREIN.
Claim 2
Independent Claim
176 words
A METHOD WHICH COMPRISES TREATING A FINELY DIVIDED SOLID MATERIAL, WHICH HAS AN ABSOLUTE DENSITY OF AT LEAST 2.5 AND IS OF NOT LARGER THAN 80 MESH PARTICLE SIZE AND WHICH IS INSOLUBLE IN AND CHEMICALLY INERT TO VINYL AROMATIC COMPOUNDS AND THEIR POLYMERS, WITH AN AGENT WHICH, WHEN APPLIED TO WATER-WETTABLE BY ORRENDERS THE LATTER REPELLENT TO WATER AND WETTABLE BY ORGANIC LIQUIDS, ADMIXING THE THUS-TREATED SOLID MATERIAL WITH AT LEAST ONE LIQUID VINYL AROMATIC HYDROCARBON TO FORM A SLURRY OF THE SOLID PARTICLES AND THE LIQUID VINYL AROMATIC HYDROCARBON, AGITATING THE SLURRY TOGETHER WITH A LARGER VOLUME OF AN AQUEOUS SALT SOLUTION THAT IS NONSOLVENT FOR SAID SLURRY AND HAS AT LEAST 0.5 PERCENT BY WEIGHT OF A STRONGLY IONIZED INORGANIC SALT DISSOLVED THEREIN, TO FORM A SUSPENSION OF DROPLETS OF SAID SLURRY IN THE AQUEOUS SALT SOLUTION WHILE HEATING THE AGITATED MIXTURE TO CAUSE POLYMERIZATION OF THE VINYL AROMATIC HYDROCARBON, WHEREBY THERE ARE FORMED SUBSTANTIALLY SPERICAL SOLID BEADS OF THE POLYMERIZED VINYL AROMATIC HYDROCARBON HAVING THE FINELY DIVIDED SOLIDE STARTING MATERIAL EMBEDDED THEREIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |