US3255158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acrylonitrile polymers using a catalytic system containing a high ratio of activator/catalyst
Assignee: EIDP Inc
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Filing: 1962-01-15
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Granted: 1966-06-07
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Expires: 1982-01-15
Abstract
No abstract record available.
Inventors
- 👤 Harrison I Anthes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:23
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/06; C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F20/00; C08F20/02; C08F20/42; C08F20/44; D01F6/00; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A PROCESS OF PREPARING ACRYLONITRILE POLYMERS IN WHICH MONOMERIC MATERIAL CONTAINING AT LEAST 85% ACRYLONITRILE AND FROM 0 TO 15% OF AT LEAST ONE OTHER ETHYLENICALLY UNSATURATED MONOMER COPOLYMERIZABLE THEREWITH IS POLYMERIZED IN AN AQUEOUS SYSTEM IN THE PRESENCE OF A PERSULFATE CATALYST AND AN ACTIVATOR COMPRISING A SULFOXY REDUCING AGENT, THE IMPROVEMENT TO PRODUCE WHITE COLOR-STABLE POLYMER COMPRISING POLYMERIZING THE MONOMERIC MATERIALS IN AN AQUEOUS SYSTEM IN WHICH THE CONCENTRATION OF THE ACRYLONITRILE IS SUCH THAT IT IS SOLUBLE IN THE WATER PRESENT AND USING A RATIO OF ACTIVATOR TO CATALYST THAT IS AT LEAST 10:1 BY WEIGHT.
Claim 2
Dependent Claim
100 words
IN A PROCESS OF PREPARING ACRYLONITRILE POLYMERS IN WHICH MONOMERIC MATERIAL CONTAINING AT LEAST 85% ACRYLONITRILE AND FROM 0 TO 15% OF AT LEAST ONE OTHER ETHYLENICALLY UNSATURATED MONOMER COPOLYMERIZABLE THEREWITH IS POLYMERIZED IN AN AQUEOUS SYSTEM IN THE PRESENCE OF A PERSULFATE CATALYST AND AN ACTIVATOR COMPRISING A SULFOXY REDUCING AGENT, THE IMPROVEMENT TO PRODUCE WHITE COLOR-STABLE POLYMER COMPRISING POLYMERIZING THE MONOMERIC MATERIALS IN AN AQUEOUS SYSTEM IN WHICH THE CONCENTRATION OF THE ACRYLONITRILE IS SUCH THAT IT IS SOLUBLE IN THE WATER PRESENT AND USING A RATIO OF ACTIVATOR TO CATALYST THAT IS AT LEAST 10:1 BY WEIGHT.
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) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |