US3591571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superchlorinated polyvinyl chloride and method of producing it
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1966-02-15
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Granted: 1971-07-06
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Expires: 1986-02-15
Abstract
Abstract PROCESS FOR THE PRODUCTION OF SUPERCHLORINATED POLYVINYL CHLORIDE AND PRODUCT THEREOF. THE PVC IS SWOLLEN IN A FIRST STEP BY INSUFFLATING WITH GASEOUS CHLORO-HYDROCARBON OF WHICH CHLOROFORM IS PREFERRED. THE SWOLLEN PVC IS SUSPENDED IN A CONCENTRATED AQUEOUS SOLUTION OF HCL. CHLORINE IS THEN PASSED INTO THE SUSPENSION TO ABOUT SATURATION, AFTER WHICH THE SUSPENSION IS IRRADIATED WITH ULTRVIOLET RAYUS, WHILE CHLORINATION IS CONTINUED TO THE DESIRED VALUE. THE PROCESS IS OF RELATIVELY SHORT DURATION, EFFICIENT IN USE OF INGREDIENTS AND REACTANTS, AND GIVES A HIGH QUALITY OF SPVC OF UNIFORM GRANULOMETRY AND PRECISE CONTROL OF CHLORINE PERCENTAGE OF FINISHED PRODUCT.
Inventors
- 👤 Georgette Steinbach-Van Gaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:01
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |