Patent US4752969A successfully refreshed from Google Patents.
Patent US3218302A successfully refreshed from Google Patents.
US3218302A
Expired / Lapsed
US
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Suspension polymerization
Assignee: Rohm and Haas Co
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Filing: 1960-06-08
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Granted: 1965-11-16
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Expires: 1980-06-08
Abstract
No abstract record available.
Inventors
- 👤 Melamed Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:15
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/06; C08F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A PROCESS FOR THE POLYMERIZATION IN A LIQUID MEDIUM OF ETHYLENICALLY UNSATURATED MONOMERIC MOLECULES HAVING A H2C=C<GROUP TO FORM A POLYMER INSOLUBLE IN THE MEDIUM BY HEATING THE MOLECULES IN THE LIQUID MEDIUM CONTAINING DISSOLVED THEREIN A FREE-RADICAL INITIATOR AND FROM 0.1 TO 2% BY WEIGHT, BASED ON THE WEIGHT OF MONOMER MOLECULES, OF A GRANULATING AGENT, THE AMOUNT OF MONOMER MOLECULES BEING FROM 1 TO 60% BY WEIGHT OF THE MIXTURE THEREOF WITH THE ORGANIC SOLVENT MEDIUM, THE IMPROVEMENT CHARACTERIZED IN THAT THE LIQUID MEDIUM IS AN ORGANIC NON-AQUEOUS WATER-IMMISCIBLE INERT LIQUID MEDIUM BOILING IN THE RANGE OF 40* TO 200*C. IN WHICH THE POLYMER FORMED FROM THE MONOMERIC MOLECULES IS INSOLUBLE, THE TEMPERATURE OF THE MEDIUM IS MAINTAINED IN THE RANGE OF 40* TO 200*C., AND THE GRANULATING AGENT IS A WATER-INSOLUBLE COPOLYMER, HAVING A MOLECULAR WEIGHT OF AT LEAST 100,000, OF A MIXTURE OF (A) 99 TO 70% BY WEIGHT OF AT LEAST ONE ESTER OF THE FORMULA
Claim 2
Dependent Claim
162 words
IN A PROCESS FOR THE POLYMERIZATION IN A LIQUID MEDIUM OF ETHYLENICALLY UNSATURATED MONOMERIC MOLECULES HAVING A H2C=C<GROUP TO FORM A POLYMER INSOLUBLE IN THE MEDIUM BY HEATING THE MOLECULES IN THE LIQUID MEDIUM CONTAINING DISSOLVED THEREIN A FREE-RADICAL INITIATOR AND FROM 0.1 TO 2% BY WEIGHT, BASED ON THE WEIGHT OF MONOMER MOLECULES, OF A GRANULATING AGENT, THE AMOUNT OF MONOMER MOLECULES BEING FROM 1 TO 60% BY WEIGHT OF THE MIXTURE THEREOF WITH THE ORGANIC SOLVENT MEDIUM, THE IMPROVEMENT CHARACTERIZED IN THAT THE LIQUID MEDIUM IS AN ORGANIC NON-AQUEOUS WATER-IMMISCIBLE INERT LIQUID MEDIUM BOILING IN THE RANGE OF 40* TO 200*C. IN WHICH THE POLYMER FORMED FROM THE MONOMERIC MOLECULES IS INSOLUBLE, THE TEMPERATURE OF THE MEDIUM IS MAINTAINED IN THE RANGE OF 40* TO 200*C., AND THE GRANULATING AGENT IS A WATER-INSOLUBLE COPOLYMER, HAVING A MOLECULAR WEIGHT OF AT LEAST 100,000, OF A MIXTURE OF (A) 99 TO 70% BY WEIGHT OF AT LEAST ONE ESTER OF THE FORMULA
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |