US2777832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for the polymerization of acrylonitrile
Assignee: Wyeth Holdings LLC
•
Filing: 1951-05-22
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Granted: 1957-01-15
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Expires: 1971-05-22
Abstract
No abstract record available.
Inventors
- 👤 Mallison William Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:00
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/12; C08F2/16; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR PRODUCING A POLYMER WHICH COMPRISES CONTINUOUSLY FEEDING, FOR POLYMERIZATION, ACRYLONITRILE WITH UP TO ABOUT 15% BY WEIGHT OF A DIFFERENT MONOETHYLENICALLY UNSATURATED COMPOUND, COPOLYMERIZABLE THEREWITH, INTO AN AGITATED POLYMERIZATION ZONE, SAID POLYMERIZATION OCCURING IN THE PRESENCE OF A POLYMERIZATION CATALYST, SAID ZONE BEING AN AQUEOUS POLYMER SUSPENSION HAVING A MONOMER CONCENTRATION OF FROM ABOUT 1 TO 10% AND A SUBSTANTIALLY CONSTANT QUANTITY OF POLYMER IN THE FORM OF COMPACT ROUNDED QUANTITY PARTICLES, SAID QUANTITY BEING AN AMOUNT OF FROM ABOUT 19 TO 40% OF THE WEIGHT OF THE SUSPENSION, SAID ZONE BEING MAINTAINED UNDER SUBSTANTIALLY STEADY STATE CONDITIONS, INCLUDING A SUBSTANTIALLY CONSTANT TEMPERATURE WITHIN THE RANGE OF ABOUT 20*C. TO 70*C., THE CONCENTRATION OF MONOMER IN THE FEED BEING SUCH AS TO MAINTAIN THE AMOUNT OF MONOMER AND POLYMER IN THE POLYMERIZATION ZONE SUBSTANTIALLY CONSTANT.
Claim 2
Dependent Claim
138 words
A PROCESS FOR PRODUCING A POLYMER WHICH COMPRISES CONTINUOUSLY FEEDING, FOR POLYMERIZATION, ACRYLONITRILE WITH UP TO ABOUT 15% BY WEIGHT OF A DIFFERENT MONOETHYLENICALLY UNSATURATED COMPOUND, COPOLYMERIZABLE THEREWITH, INTO AN AGITATED POLYMERIZATION ZONE, SAID POLYMERIZATION OCCURING IN THE PRESENCE OF A POLYMERIZATION CATALYST, SAID ZONE BEING AN AQUEOUS POLYMER SUSPENSION HAVING A MONOMER CONCENTRATION OF FROM ABOUT 1 TO 10% AND A SUBSTANTIALLY CONSTANT QUANTITY OF POLYMER IN THE FORM OF COMPACT ROUNDED QUANTITY PARTICLES, SAID QUANTITY BEING AN AMOUNT OF FROM ABOUT 19 TO 40% OF THE WEIGHT OF THE SUSPENSION, SAID ZONE BEING MAINTAINED UNDER SUBSTANTIALLY STEADY STATE CONDITIONS, INCLUDING A SUBSTANTIALLY CONSTANT TEMPERATURE WITHIN THE RANGE OF ABOUT 20*C. TO 70*C., THE CONCENTRATION OF MONOMER IN THE FEED BEING SUCH AS TO MAINTAIN THE AMOUNT OF MONOMER AND POLYMER IN THE POLYMERIZATION ZONE SUBSTANTIALLY CONSTANT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |