Patent US3814740A successfully refreshed from Google Patents.
US3814740A
Expired / Lapsed
US
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Preparation of methacrylate copolymers
Assignee: KAY-FRIES Inc
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Filing: 1972-07-13
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Granted: 1974-06-04
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Expires: 1992-07-13
Abstract
Abstract THIS PROCESS PROVIDES FOR THE PREPARATION OF COPOLYMERS OF METHYL METHACRYLATE WITH UP TO 20 MOL PERCENT OF AN ACRYLATE ESTER, THE PROCESS COMPRISING REACTING THE MONOMERS IN AN AQUEOUS EMULSION IN THE PRESENCE OF A WATERSOLUBLE FREE RADICAL CATALYST, AN EMULSIFYING AGENT AND A CHAIN TRANSFER AGENT, WHEREIN THE TEMPERATURE IS MAINTAINED AT FROM ABOUT 50 TO ABOUT 70*C. UNTIL FROM 40 TO 60 MOLE PERCENT OF THE MONOMERS HAVE REACTED AND THEN INCREASING TEMPERTURES TO 70 TO 100*C. THE POLUMER IS PREFERABLY SPRAY-DRIED TO A PARTICLE SIZE OF NOT GREATER THAN ABOUT 450 MICRONS.
Inventors
- 👤 R Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:30
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; C08L; C08L27/00; C08L27/02; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; Y; Y10; Y10S; Y10S526/00; Y10S526/909; Y10S526/911
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |