US2902464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of vinylidene monomers
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-05-13
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Granted: 1959-09-01
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Expires: 1977-05-13
Abstract
No abstract record available.
Inventors
- 👤 Earl C Chapin
- 👤 Leo P Paradis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:36
CPC Classifications
C; C08; C08F; C08F4/00; C08F279/00; C08F279/02; Y; Y10; Y10S; Y10S525/00; Y10S525/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS COMPRISING MASS POLYMERIZING A VINYLIDENE MONOMER IN THE PRESENCE OF FROM AT LEAST TRACE QUANTITIES TO 100X10**5 MOL PERCENT OF A DISUBSTITUTED DIHYDROANTHRACENE AT A TEMPERATURE OF FROM 60-180* C. UNTIL AT LEAST 95% CONVERSION IS ATTAINED AND THE FINISHING THE POLYMERIZATION AT A TEMPERATURE OF FROM 180-200* C. OVER A PERIOD OF FROM 2-5 HOURS; SAID VINYLIDENE MONOMER BEING SELECTED FROM THE GROUP CONSISTING OF STYRENE, RING SUBSTITUTED MONO-AND DIMETHYL STYRENES, RING SUBSTITUTED MONO- AND DI-CHLORO STYRENES, AND THE METHYL AND ETHYL ESTERS OF CARYLIC AND METHACRYLIS ACIDS; SAID DISUBSTITUTED DIHYDROANTHRACENE HAVING THE FORMULA:
Claim 2
Dependent Claim
97 words
A PROCESS COMPRISING MASS POLYMERIZING A VINYLIDENE MONOMER IN THE PRESENCE OF FROM AT LEAST TRACE QUANTITIES TO 100X10**5 MOL PERCENT OF A DISUBSTITUTED DIHYDROANTHRACENE AT A TEMPERATURE OF FROM 60-180* C. UNTIL AT LEAST 95% CONVERSION IS ATTAINED AND THE FINISHING THE POLYMERIZATION AT A TEMPERATURE OF FROM 180-200* C. OVER A PERIOD OF FROM 2-5 HOURS; SAID VINYLIDENE MONOMER BEING SELECTED FROM THE GROUP CONSISTING OF STYRENE, RING SUBSTITUTED MONO-AND DIMETHYL STYRENES, RING SUBSTITUTED MONO- AND DI-CHLORO STYRENES, AND THE METHYL AND ETHYL ESTERS OF CARYLIC AND METHACRYLIS ACIDS; SAID DISUBSTITUTED DIHYDROANTHRACENE HAVING THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |