US2772252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terpolymer systems
Assignee: Monsanto Chemicals Ltd
•
Filing: 1952-09-11
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Granted: 1956-11-27
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Expires: 1972-09-11
Abstract
No abstract record available.
Inventors
- 👤 Briskin Joseph
- 👤 Earl C Chapin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:59
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/62; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/10; C08F220/00; C08F220/02; C08F220/42; C08F220/44; Y; Y10; Y10S; Y10S526/00; Y10S526/937; Y10S526/94
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A SUBSTANTIALLY CLEAR, HYDROCARBON-RESISTANT, CARBON TETRACHLORIDE-RESISTANT AND BOILING-WATER-RESISTANT TERPOLYMER OF 55 TO 72 MOL PERCENT OF STYRENE, 1 TO 30 MOL PERCENT OF ACRYLIC ACID FROM 9 TO 37 MOL PERCENT OF ACRYLONITRILE, SAID TERPOLYMER HAVING BEEN PREPARED BY A MASS POLYMERIZATION PROCESS IN WHICH THE MONOMERS ARE FIRST MIXED TOGETHER IN THE PROPORTIONS DESIRED IN THE TERPOLYMER AND THE MIXTURE IS THEN POLYMERIZED AT 90 TO 180* C. IN THE PRESENCE OF PEROXY CATALYSTS AND IN THE SUBSTANTIAL ABSENCE OF OXYGEN.
Claim 2
Dependent Claim
82 words
A SUBSTANTIALLY CLEAR, HYDROCARBON-RESISTANT, CARBON TETRACHLORIDE-RESISTANT AND BOILING-WATER-RESISTANT TERPOLYMER OF 55 TO 72 MOL PERCENT OF STYRENE, 1 TO 30 MOL PERCENT OF ACRYLIC ACID FROM 9 TO 37 MOL PERCENT OF ACRYLONITRILE, SAID TERPOLYMER HAVING BEEN PREPARED BY A MASS POLYMERIZATION PROCESS IN WHICH THE MONOMERS ARE FIRST MIXED TOGETHER IN THE PROPORTIONS DESIRED IN THE TERPOLYMER AND THE MIXTURE IS THEN POLYMERIZED AT 90 TO 180* C. IN THE PRESENCE OF PEROXY CATALYSTS AND IN THE SUBSTANTIAL ABSENCE OF OXYGEN.
References Cited (Backward Citations)
US1933052A
Cited
US2604457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |