US3580947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of retarding polymerization in the process for the production of methacrylic acid esters
Assignee: Mitsubishi Chemical Corp
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Filing: 1967-10-26
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Granted: 1971-05-25
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Expires: 1987-10-26
Abstract
Abstract A METHOD OF RETARDING POLYMERIZATION IN THE PROCESS FOR THE PRODUCTION OF METHACRYLIC ACID ESTERS BY THE REACTION OF ACETONE CYANHYDRIN OR METHACRYLONITRILE WITH SULFURIC ACID OR FUMING SULFURIC ACID AND ALCOHOL, SAID METHOD BEING CHARACTERIZED BY USING AS A POLYMERIZATIONRETARDER A COMPOUND HAVING IN ITS MOLECULAR STRUCTURE AN ORGANIC RING SYSTEM REPRESENTED BY 1,2-(-X-(1,2-PHENYLENE)-NH-)-NAPHTHALENE 1,2-(-NH-(1,2-PHENYLENE)-X-)-NAPHTHALENE WHEREIN X STANDS FOR SULFUR, OXYGEN OR NITROGEN ATOM.
Inventors
- 👤 Masashi Ikeda
- 👤 Masayoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38; C08F2/40
Claims Analysis
Total Claims: 0
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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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |