US2610173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymerizing acrylonitrile and vinylidene chloride at constant reflux temperature
Assignee: Monsanto Chemicals Ltd
•
Filing: 1948-08-31
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Granted: 1952-09-09
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Expires: 1968-08-31
Abstract
No abstract record available.
Inventors
- 👤 George E Ham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:09
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF PREPARING COPOLYMERS OF 80 TO 98 PER CENT OF ACRYLONITRILE AND FROM TWO TO 20 PER CENT OF VINYLIDENE CHLORIDE WHICH COMPRISES ADDING THE MONOMERS IN FIXED RELATIVE PROPORTIONS TO AN AQUEOUS MEDIUM IN THE PRESENCE OF A WATER-SOLUBLE PEROXY COMPOUND AND A WETTING AGENT AT THE REFLUX TEMPERATURE OF THE AQUEOUS MEDIUM, SAID ADDITION BEING MADE CONTINUOUSLY AT A VARYING RATE SUCH THAT THE REFLUX TEMPERATURE REMAINS CONSTANT, AND REMOVING THE POLYMERIZED PRODUCT FROM THE REACTION MEDIUM AFTER THE POLYMERIZATION REACTION HAS ENDED.
Claim 2
Independent Claim
87 words
A METHOD OF PREPARING COPOLYMERS OF 80 TO 98 PER CENT OF ACRYLONITRILE AND FROM TWO TO 20 PER CENT OF VINYLIDENE CHLORIDE WHICH COMPRISES ADDING THE MONOMERS IN FIXED RELATIVE PROPORTIONS TO AN AQUEOUS MEDIUM IN THE PRESENCE OF A WATER-SOLUBLE PEROXY COMPOUND AND A WETTING AGENT AT THE REFLUX TEMPERATURE OF THE AQUEOUS MEDIUM, SAID ADDITION BEING MADE CONTINUOUSLY AT A VARYING RATE SUCH THAT THE REFLUX TEMPERATURE REMAINS CONSTANT, AND REMOVING THE POLYMERIZED PRODUCT FROM THE REACTION MEDIUM AFTER THE POLYMERIZATION REACTION HAS ENDED.
References Cited (Backward Citations)
US2278415A
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US2238020A
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US2404779A
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US2486241A
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US2436926A
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US2456360A
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US2496384A
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US2496267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |