Patent US3801519A successfully refreshed from Google Patents.
US3801519A
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Aqueous suspension polymerization in the presence of c3-c4 hydroxyalkyl carboxymethyl cellulose ethers as dispersing agents
Assignee: Dow Chemical Co
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Filing: 1972-09-21
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Granted: 1974-04-02
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Expires: 1992-09-21
Abstract
Abstract C3-C4 HYDROXYALKYL CARBOXYMETHYL CELLULOSE ETHERS HAVING A C3-C4 HYDROXYALKYL MS OF FROM ABOUT 0.2 TO 2.5 AND A CARBOXYMETHYL DS OF FROM ABOUT 0.1 AND 0.9 ARE SUPERIOR PROTECTIVE COLLOIDS IN THE NON-EMULSIFIED AQUEOUS SUSPENSION POLYMERIZATION OF VINYL CHLORIDE.
Inventors
- 👤 T Brodof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:37
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |