US2951834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed anhydrides and their use as catalysts for the polymerisation of ethylenically unsaturated compounds
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1958-03-25
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Granted: 1960-09-06
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Expires: 1978-03-25
Abstract
No abstract record available.
Inventors
- 👤 Scott Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:17
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR THE PRODUCTION OF POLYMERS WHICH COMPRISES SUBJECTING A COMPOUND SELECTED FROM THE CLASS CONSISTING OF ETHYLENE, VINYL ACETATE, METHYL METHACRYLATE AND ACRYLONITRILE TO POLYMERIZATION CONDITIONS IN THE PRESENCE OF A CATALYTIC AMOUNT OF A MIXED ANHYDRIDE AT A TEMPERATURE NOT LOWER THAN -40*C., SAID ANHYDRIDE HAVING THE FORMULA:
Claim 2
Dependent Claim
44 words
A PROCESS AS CLAIMED IN CLAIM 8 WHEREIN THE COMPOUND IS ETHYLENE, SAME BEING CONTACTED AT A TEMPERATURE BETWEEN -40*C. AND 180*C. AND A PRESSURE ABOVE 100 ATMOSPHERES WITH A CATALYTIC AMOUNT OF A SOLUTION OF A MIXED ANHYDRIDE AS DEFINED IN CLAIM 8.
References Cited (Backward Citations)
US2816883A
Cited
BE538782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |