Patent US2809945A successfully refreshed from Google Patents.
US2809945A
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Polyvinyl acetate emulsions stabilized with hydroxyethyl cellulose and method of preparation
Assignee: Shawinigan Chemicals Ltd
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Filing: 1955-06-13
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Granted: 1957-10-15
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Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 Wright Edward Harvey
- 👤 Pickard George Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:32
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/07; C08L; C08L31/00; C08L31/02; C08L31/04; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/284; C08L2201/00; C08L2201/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A METHOD WHICH COMPRISES ADDING TO AN EMULSION POLYMERIZED POLYVINYL ACETATE EMULSION CONTAINING HYDROXYETHYL CELLULOSE AS THE PRINCIPAL STABILIZER, A QUANTITY OF GLYOXAL BETWEEN 0.3 AND 3% BY WEIGHT OF THE POLYVINYL ACETATE, WHILE THE EMULSION IS AT AN ELEVATED TEMPERATURE ABOVE ABOUT 40*C. AND NOT GREATER THAN ABOUT 90*C.
Claim 2
Independent Claim
50 words
A METHOD WHICH COMPRISES ADDING TO AN EMULSION POLYMERIZED POLYVINYL ACETATE EMULSION CONTAINING HYDROXYETHYL CELLULOSE AS THE PRINCIPAL STABILIZER, A QUANTITY OF GLYOXAL BETWEEN 0.3 AND 3% BY WEIGHT OF THE POLYVINYL ACETATE, WHILE THE EMULSION IS AT AN ELEVATED TEMPERATURE ABOVE ABOUT 40*C. AND NOT GREATER THAN ABOUT 90*C.
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) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |