US3578649A
Expired / Lapsed
US
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Preparation of vinyl polymers
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1964-06-23
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Granted: 1971-05-11
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Expires: 1984-06-23
Abstract
Abstract VINYL MONOMERS, OF WHICH VINYL CHLORIDE IS EXEMPLARY, ARE POLYMERIZED IN SUSPENSION IN AQUEOUS MEDIUM AND THE CONDITIONS OF POLYMERIZATION PRODUCE SUPERIOR PRODUCTS BY WITHDRAWING VAPORIZED PRODUCT, CONDENSING IT, AND RETURNING IT TO THE SUSPENSION, PRODUCING, BY AID OF EXTERIOR HEAT EXCHANGE, EQUALITY OF INTERNAL AND EXTERNAL TEMPERATURE. THE PRODUCT HAS NOTABLE SUPERIORITY, ESPECIALLY IN ITS ACCEPTANCE OF PLASTICIZERS AND OTHER MODIFIERS.
Inventors
- 👤 Leon Badguerahanian
- 👤 Thomas Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:58
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/18; B; B01; B01F; B01F27/00; B01F27/80; B01F27/84; B01J; B01J19/00; B01J19/18; C08F2/002; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00058; B01J2219/00063; B01J2219/00069; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00101; B01J2219/00177; B01J2219/18; B01J2219/185; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |