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Patent US3595940A successfully refreshed from Google Patents.
US3595940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft copolymers and process for their manufacture
Assignee: Hoechst AG
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Filing: 1968-10-29
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Granted: 1971-07-27
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Expires: 1988-10-29
Abstract
Abstract THE PRESENT INVENTION RELATES TO CRYSTAL CLEAR GRAFT COPOLYMERS OF HIGH IMPACT STRENGHT AND THEIR MANUFACTURE BY POLYMERIZING VINYL CHLORIDE TO AN EXTENT OF POLYMERIZATION OF 50 TO 85%, THEN ADDING AN ELASTOMER LATEX OBTAINED FROM BUTADIENE, STYRENE AND VINYL ESTERS, IN AN AMOUNT WITHIN THE RANGE OF FROM 1 TO 30% BY WEIGHT CALCULATED ON THE VINYL CHORIDE AND FINALLY CONTINUING THE POLYMERIZATION OF THE WHOLE MIXTURE. THE RESULTING GRAFT COPOLYMERS CAN BE USED EITHER ALONE OR IN ADMIXTURE WITH SUSPENSION OR MASS POLYVINYL CHLORIDE FOR MAKING CRYSTAL CLEAR SHAPED ARTICLES OF HIGH NOTCHED IMPACT TENSILE STRENGTH.
Inventors
- 👤 Gerhard Kuhne
- 👤 Jurgen Kuhis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:43
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |