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US2782173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyvinyl acetate beads and emulsions
Assignee: EIDP Inc
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Filing: 1953-05-15
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Granted: 1957-02-19
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Expires: 1973-05-15
Abstract
No abstract record available.
Inventors
- 👤 John E Bristol
- 👤 Edward P Czerwin
- 👤 Turnbull Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:51
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR PREPARING A DISPERSION POLYVINYL ACETATE COMPRISING POLYMERIZING AT REFLUX TEMPERATURE IN THE PRESENCE OF POLYMERIZATION CATALYST VINYL ACETATE TO A SOLIDS CONTENT OF ABOUT 30% BY WEIGHT AND THEREAFTER MIXING THE POLYMERIZATE WITH AGITATION AND HEAT WITH AN AQUEOUS SOLUTION CONTAINING 0.04 TO 1% BY WEIGHT BASED ON THE POLYVINYL ACETATE OF POLYVINYL ALCOHOL HYDROLYZED BETWEEN ABOUT 80 AND 90% AND RECOVERING THE REACTED VINYL ACETATE BY DISTILLATION.
Claim 2
Dependent Claim
71 words
A PROCESS FOR PREPARING A DISPERSION POLYVINYL ACETATE COMPRISING POLYMERIZING AT REFLUX TEMPERATURE IN THE PRESENCE OF POLYMERIZATION CATALYST VINYL ACETATE TO A SOLIDS CONTENT OF ABOUT 30% BY WEIGHT AND THEREAFTER MIXING THE POLYMERIZATE WITH AGITATION AND HEAT WITH AN AQUEOUS SOLUTION CONTAINING 0.04 TO 1% BY WEIGHT BASED ON THE POLYVINYL ACETATE OF POLYVINYL ALCOHOL HYDROLYZED BETWEEN ABOUT 80 AND 90% AND RECOVERING THE REACTED VINYL ACETATE BY DISTILLATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |