US3013305A
Expired / Lapsed
US
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Method for making copolymers
Assignee: Peterlite Products Ltd
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Filing: 1956-03-16
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Granted: 1961-12-19
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Expires: 1976-03-16
Abstract
No abstract record available.
Inventors
- 👤 Peter Maurice Jacques Gooreynd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:26
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08; Y; Y10; Y10S; Y10S264/00; Y10S264/42; Y10S264/59; Y10S264/66
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
A METHOD OF MANUFACTURING ATRANSPARENT HOMOGENEOUS COPOLYMER, COMPRISING MAKING A MONOMERIC MIXTURE CONSISTING OF 50% TO 85% BY WEIGHT OF DIETHYLENE GLYCOL BIS (ALLYL CARBONATE) AND 50% TO 15% BY WEIGHT OF A COMONOMER, POLYMERISING SAID MIXTURE TO A CASTING SYRUP HAVING AT 25*C. A VISCOSITY BETWEEN 150 AND 1800 CENTISTOKES, HEATING SAID SYRUP AT 40*C. TO 70*C. FOR 50 TO 80 HOURS TO FORM DIRECTLY FROM SAID SYRUP A RIGID FUSIBLE MATERIAL, SOFTENING SAID MATERIAL BY HEATING AND SHAPING IT WHILE SOFTENED, AND HEATING SAID SHAPED SOLID MATERIAL AT A TEMPERATURE IN EXCESS OF 100*C. WHILE HELD IN THE SHAPED FORM TO CONVERT SAID MATERIAL TO INFUSIBLE INSOLUBLE FORM.
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) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |