Patent US3578646A successfully refreshed from Google Patents.
US3578646A
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US
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Vinyl monomer polymerization process
Assignee: Phillips Petroleum Co
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Filing: 1969-10-29
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Granted: 1971-05-11
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Expires: 1989-10-29
Abstract
Abstract POURABILITY OF POLYMERS OF VINYL MONOMERS IS IMPROVED BY CATALYTIC VAPOR PHASE POLYMERIZATION OF VINYL MONOMERS IN THE ABSENCE OF SUBSTANTIAL AMOUNTS OF SOLVENT OR DILUENT AND IN THE PRESENCE OF CERTAIN POURABILITY MODIFIERS, WHICH MAY ALSO IMPROVE THE COLOR OF THE PRODUCT POLYMER. THE POURABILITY OF POLYMERS FORMED BY LIQUID PHASE BULK POLYMERIZATION OF VINYL MONOMERS CAN BE IMPROVED BY THESE MODIFIERS.
Inventors
- 👤 Charles W Moberly
- 👤 Gerald R Kahle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:03
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
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) | 1974-05-10 | 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 |