US2987542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of methyl methacrylate
Assignee: Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
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Filing: 1959-01-21
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Granted: 1961-06-06
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Expires: 1979-01-21
Abstract
No abstract record available.
Inventors
- 👤 Modiano Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:54
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/18; C07C67/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IMPROVEMENTS IN THE MANUFACTURE OF METHYL METHACRYLATE BY THE CONVERSION OF ACETONE CYANOHYDRIN TO AMIDE AND ESTERIFICATION OF THE AMIDE BY METHANOL, THE SAID IMPROVEMENTS CONSISTING ESSENTIALLY IN: TREATING THE CONDENSATE OF THE AZEOTROPIC MIXTURE OF METHYL METHACRYLATE, METHANOL AND WATER COMING FROM THE ESTERIFICATION STAGE WITH A QUANTITY OF WATER OF LESS WEIGHT THAN THE CONDENSATE, AT A TEMPERATURE LESS THAN 20* C., STIRRING AND THEN DECANTING THE SAID MIXTURE IN ORDER TO OBTAIN AN AQUEOUS PHASE CONTAINING THE GREATER PART OF THE METHANOL, AND AN ORGANIC PHASE CONTAINING THE GREATER PART OF THE ESTER, DIRECTLY RECYCLING THE SAID AQUEOUS PHASE INTO THE PRODUCTION CYCLE, AND SUBJECTING THE SAID ORGANIC PHASE TO FRACTIONAL DISTILLATION, SO AS TO EXTRACT THEREFROM PURE METHYL METHACRYLATE.
Claim 2
Dependent Claim
123 words
IMPROVEMENTS IN THE MANUFACTURE OF METHYL METHACRYLATE BY THE CONVERSION OF ACETONE CYANOHYDRIN TO AMIDE AND ESTERIFICATION OF THE AMIDE BY METHANOL, THE SAID IMPROVEMENTS CONSISTING ESSENTIALLY IN: TREATING THE CONDENSATE OF THE AZEOTROPIC MIXTURE OF METHYL METHACRYLATE, METHANOL AND WATER COMING FROM THE ESTERIFICATION STAGE WITH A QUANTITY OF WATER OF LESS WEIGHT THAN THE CONDENSATE, AT A TEMPERATURE LESS THAN 20* C., STIRRING AND THEN DECANTING THE SAID MIXTURE IN ORDER TO OBTAIN AN AQUEOUS PHASE CONTAINING THE GREATER PART OF THE METHANOL, AND AN ORGANIC PHASE CONTAINING THE GREATER PART OF THE ESTER, DIRECTLY RECYCLING THE SAID AQUEOUS PHASE INTO THE PRODUCTION CYCLE, AND SUBJECTING THE SAID ORGANIC PHASE TO FRACTIONAL DISTILLATION, SO AS TO EXTRACT THEREFROM PURE METHYL METHACRYLATE.
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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |