US2757166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization catalyst
Assignee: Wyeth Holdings LLC
•
Filing: 1952-10-15
•
Granted: 1956-07-31
•
Expires: 1972-10-15
Abstract
No abstract record available.
Inventors
- 👤 Nicholas R Segro
- 👤 James A Melchore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:10
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE PROCESS WHICH COMPRISES BULK COPOLYMERIZING ACRYLONITRILE AND AT LEAST ONE MONOMERIC COMPOUND CONTAINING A POLYMERIZABLE CH2=C< GROUPING AND HAVING A BOILING POINT OF AT LEAST 60* C. IN THE PRESENCE OF FROM 0.01% TO 5% BY WEIGHT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF TERTIARY BUTYL PERMALEIC ACID AND TERTIARY BUTYL PERPHTHALIC ACID, AT TEMPERATURES OF FROM 85* C. TO 130* C. AND AT APPROXIMATELY ATMOSPHERIC PRESSURE, THE AMOUNT OF ACRYLONITRILE BEING FROM 5% TO 35% BY WEIGHT OF THE TOTAL MONOMERS.
Claim 2
Dependent Claim
85 words
THE PROCESS WHICH COMPRISES BULK COPOLYMERIZING ACRYLONITRILE AND AT LEAST ONE MONOMERIC COMPOUND CONTAINING A POLYMERIZABLE CH2=C< GROUPING AND HAVING A BOILING POINT OF AT LEAST 60* C. IN THE PRESENCE OF FROM 0.01% TO 5% BY WEIGHT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF TERTIARY BUTYL PERMALEIC ACID AND TERTIARY BUTYL PERPHTHALIC ACID, AT TEMPERATURES OF FROM 85* C. TO 130* C. AND AT APPROXIMATELY ATMOSPHERIC PRESSURE, THE AMOUNT OF ACRYLONITRILE BEING FROM 5% TO 35% BY WEIGHT OF THE TOTAL MONOMERS.
References Cited (Backward Citations)
US2426476A
Cited
US2497323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |