Patent US3275582A successfully refreshed from Google Patents.
US3275582A
Expired / Lapsed
US
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Carbohydrate derived polymers of acrylonitrile
Assignee: Individual
•
Filing: 1963-10-11
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Granted: 1966-09-27
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Expires: 1983-10-11
Abstract
No abstract record available.
Inventors
- 👤 William A P Black
- 👤 Eric T Dewar
- 👤 Rutherford David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:55
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C07; C07D; C07D317/00; C07D317/08; C07D317/10; C07D317/14; C07D317/28; C08B; C08B37/00; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F24/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
THE COPOLYMER OBTAINED BY STIRRING AT 35*C. ABOUT 4.11 PARTS BY WEIGHT OF ACRYLONITRILE AND 1 PART BY WEIGHT OF 3-O-ALLYL-1,2:5,6-DI-O-ISOPROPYLIDENE-A-D-GLUCOFURANOSE IN THE PRESENCE OF WATER, AN ANIONIC EMULSIFIER, AND A 3:1 RATIO OF POTASSIUM PERSULFATE INITIATOR AND SODIUM BISULFITE ACTIVATOR, ADDING ADDITIONAL INITIATOR-ACTIVATOR MIXTURE AT THE END OF 1 HOUR OF REACTION, AND THEN CONTINUING THE EMULSION COPOLYMERIZATION FOR 24 HOURS, SAID COPOLYMER CONSISTING OF ABOUT 98 MOLE PERCENT OF ACRYLONITRILE AND ABOUT 2 MOLE PERCENT OF 3-O-ALLYL-DISOPROPYLIDENEGLUCOFURANOSE, A 0.1 PERCENT SOLUTION OF SAID COPOLYMER IN DIMETHYLFORMAMIDE AT 25*C. HAVING AN INTRINSIC VISCOSITY OF 4.2 DL./GM.
Claim 2
Dependent Claim
97 words
THE COPOLYMER OBTAINED BY STIRRING AT 35*C. ABOUT 4.11 PARTS BY WEIGHT OF ACRYLONITRILE AND 1 PART BY WEIGHT OF 3-O-ALLYL-1,2:5,6-DI-O-ISOPROPYLIDENE-A-D-GLUCOFURANOSE IN THE PRESENCE OF WATER, AN ANIONIC EMULSIFIER, AND A 3:1 RATIO OF POTASSIUM PERSULFATE INITIATOR AND SODIUM BISULFITE ACTIVATOR, ADDING ADDITIONAL INITIATOR-ACTIVATOR MIXTURE AT THE END OF 1 HOUR OF REACTION, AND THEN CONTINUING THE EMULSION COPOLYMERIZATION FOR 24 HOURS, SAID COPOLYMER CONSISTING OF ABOUT 98 MOLE PERCENT OF ACRYLONITRILE AND ABOUT 2 MOLE PERCENT OF 3-O-ALLYL-DISOPROPYLIDENEGLUCOFURANOSE, A 0.1 PERCENT SOLUTION OF SAID COPOLYMER IN DIMETHYLFORMAMIDE AT 25*C. HAVING AN INTRINSIC VISCOSITY OF 4.2 DL./GM.
Claim 3
Dependent Claim
26 words
THE DEACETONATED COPOLYMER OBTAINED BY TREATING A TETRAHYDROTHIOPHENE-1,1-DIOXIDE SOLUTION OF THE COPOLYMER OF CLAIM 1 WITH HCL UNTIL THE OPTICAL ROTATION OF THE SOLUTION BECOMES CONSTANT.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |