US2565141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal stabilization of polymeric methyl methacrylate
Assignee: EIDP Inc
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Filing: 1949-08-26
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Granted: 1951-08-21
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Expires: 1969-08-26
Abstract
No abstract record available.
Inventors
- 👤 Marks Barnard Mitchel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:06
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/14; C08F2/00; C08F2/12; C08F2/16; C08F2/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
IN THE GRANULAR POLYMERIZATION OF METHYL METHACRYLATE SUSPENDED IN AN AQUEOUS VEHICLE, THE STEPS COMPRISING CARRYING OUT SAID POLYMERIZATION IN THE PRESENCE OF A DI-ALKYL MONOSULFIDE, AND THEREAFTER HEATING THE RESULTING GRANULAR POLYMER AT 125* C.-150* C. FOR A PERIOD OF AT LEAST TWO HOURS AND UNTIL SAID MONOSULFIDE IS ACTIVATED AS A THERMAL STABILIZER.
Claim 2
Dependent Claim
55 words
IN THE GRANULAR POLYMERIZATION OF METHYL METHACRYLATE SUSPENDED IN AN AQUEOUS VEHICLE, THE STEPS COMPRISING CARRYING OUT SAID POLYMERIZATION IN THE PRESENCE OF A DI-ALKYL MONOSULFIDE, AND THEREAFTER HEATING THE RESULTING GRANULAR POLYMER AT 125* C.-150* C. FOR A PERIOD OF AT LEAST TWO HOURS AND UNTIL SAID MONOSULFIDE IS ACTIVATED AS A THERMAL STABILIZER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |