US2647111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of styrene
Assignee: Monsanto Chemicals Ltd
•
Filing: 1950-12-06
•
Granted: 1953-07-28
•
Expires: 1970-12-06
Abstract
No abstract record available.
Inventors
- 👤 Shusman Tevis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:59
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN THE MASS POLYMERIZATION OF A POLYMERIZABLE MATERIAL CONTAINING AT LEAST 50% BY WEIGHT OF A VINYL AROMATIC COMPOUND, THE STEP WHICH COMPRISES EMPLOYING AS A CATALYST THEREFOR A MIXTURE OF FROM 0.02 TO 0.05 PART OF DI-(TERTIARY BUTYL) PEROXIDE AND FROM 0.02 TO 0.15 PART OF TERTIARY BUTYL PERACETATE PER 100 PARTS OF POLYMERIZABLE MATERIAL.
Claim 2
Dependent Claim
56 words
IN THE MASS POLYMERIZATION OF A POLYMERIZABLE MATERIAL CONTAINING AT LEAST 50% BY WEIGHT OF A VINYL AROMATIC COMPOUND, THE STEP WHICH COMPRISES EMPLOYING AS A CATALYST THEREFOR A MIXTURE OF FROM 0.02 TO 0.05 PART OF DI-(TERTIARY BUTYL) PEROXIDE AND FROM 0.02 TO 0.15 PART OF TERTIARY BUTYL PERACETATE PER 100 PARTS OF POLYMERIZABLE MATERIAL.
References Cited (Backward Citations)
US2403709A
Cited
US2521754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |