Patent US3759879A successfully refreshed from Google Patents.
US3759879A
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Continuous bulk polymerization process for vinyl chloride copolymers
Assignee: Occidental Chemical Corp
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Filing: 1971-05-28
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Granted: 1973-09-18
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Expires: 1991-05-28
Abstract
Abstract A CONTINUOUS, HOMOGENEOUS BLUK POLYMERIZATION PROCESS FOR PRODUCING COPOLYMERS, TERPOLYMERS, AND TETRAPOLYMERS OF VINYL CHLORIDE AND LOWER ALKYL ESTERS OF MALEIC OR FUMARIC ACIDS, WHICH POLYMERS CONTAIN A MINIMUM AMOUNT OF RESIDUAL UNREACTED MONOMER, IN A SPECIFIC TEMPERATURE-TIME CYCLE IN AT LEAST TWO REACTION ZONES IN THE PRESENCE OF KNOWN CATALYSTS AND MODIFIERS UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS. THE POLYMER FORMED MUST BE SOLUBLE IN THE MONOMER AT ALL TIMES THROUGHOUT THE POLYMERIZATION REACTION.
Inventors
- 👤 J Floros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:36
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/20; C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/0009
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |