Patent US5252973A successfully refreshed from Google Patents.
Patent US3268491A successfully refreshed from Google Patents.
US3268491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of copolymers of vinyl acetate and unsaturated dicarboxylic acids
Assignee: Kao Corp
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Filing: 1963-03-26
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Granted: 1966-08-23
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Expires: 1983-03-26
Abstract
No abstract record available.
Inventors
- 👤 Hattori Ken-Ichi
- 👤 Komeda Yoshiaki
- 👤 Ishikawa Yohsuke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:03
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F218/08; C08F22/00; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A PROCESS FOR PRODUCING WATER-SOLUBLE COPOLYMERS OF VINYL ACETATE AND AN UNSATURATED A,B-DICARBOXYLIC ACID AND A MONOALKALI HALF SALT THEREOF, SAID COPOLYMERS HAVING A MOLECULAR WEIGHT OF ABOUT 700-6000 AND A RATIO OF VINYL ACETATE TO UNSATURATED A,B-DICARBOXYLIC ACID OF AOUT 1:1, WHICH COMPRISES: REACTING TOGETHER IN AN AQUEOUS SOLUTION AND IN THE PRESENCE OF A REDOX CATALYST (A) VINYL ACETATE AND (B) AN UNSATURATED AM,B-DICARBOXYLIC ACID AT LEAST ABOUT 80% OF WHICH IS PRESENT IN THE FORM OF A MONOALKALI SALT, THE MOLE RATIO OF THE UNSATURATED A,B-DICARBOXYLIC ACID TO THE VINYL ACETATE IN THE REACTION SOLUTION BEING FROM 2:8 TO 8:2 AND THE COMBINED WEIGHTS OF THE UNSATURATED A,B-DICARBOXYLIC ACID AND THE VINYL ACETATE BEING FRM 5-100 PARTS FOR EACH 100 PARTS OF WATER, THE REDOX CATALYST BEING PRESENT IN AN AMOUNT OF 3-15% BY WEIGHT BASED ON THE COMBINED WEIGHTS OF TE UNSATURATED A,B-DICARBOXYLIC ACID AND THE VINYL ACETATE, THE AQUEOUS SOLUTION BEING AT A PH OF 3-6 AND THE REACTION BEING CARRIED OUT A TEMPERATURE ABOVE 30* C.
Claim 2
Dependent Claim
172 words
A PROCESS FOR PRODUCING WATER-SOLUBLE COPOLYMERS OF VINYL ACETATE AND AN UNSATURATED A,B-DICARBOXYLIC ACID AND A MONOALKALI HALF SALT THEREOF, SAID COPOLYMERS HAVING A MOLECULAR WEIGHT OF ABOUT 700-6000 AND A RATIO OF VINYL ACETATE TO UNSATURATED A,B-DICARBOXYLIC ACID OF AOUT 1:1, WHICH COMPRISES: REACTING TOGETHER IN AN AQUEOUS SOLUTION AND IN THE PRESENCE OF A REDOX CATALYST (A) VINYL ACETATE AND (B) AN UNSATURATED AM,B-DICARBOXYLIC ACID AT LEAST ABOUT 80% OF WHICH IS PRESENT IN THE FORM OF A MONOALKALI SALT, THE MOLE RATIO OF THE UNSATURATED A,B-DICARBOXYLIC ACID TO THE VINYL ACETATE IN THE REACTION SOLUTION BEING FROM 2:8 TO 8:2 AND THE COMBINED WEIGHTS OF THE UNSATURATED A,B-DICARBOXYLIC ACID AND THE VINYL ACETATE BEING FRM 5-100 PARTS FOR EACH 100 PARTS OF WATER, THE REDOX CATALYST BEING PRESENT IN AN AMOUNT OF 3-15% BY WEIGHT BASED ON THE COMBINED WEIGHTS OF TE UNSATURATED A,B-DICARBOXYLIC ACID AND THE VINYL ACETATE, THE AQUEOUS SOLUTION BEING AT A PH OF 3-6 AND THE REACTION BEING CARRIED OUT A TEMPERATURE ABOVE 30* C.
References Cited (Backward Citations)
US2434054A
Cited
US2643246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |