US3781336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing methacrylic acid and its esters
Assignee: Asahi Kasei Corp
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Filing: 1972-02-24
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Granted: 1973-12-25
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Expires: 1992-02-24
Abstract
Abstract AN ECONOMICAL METHOD FOR PRODUCING METHACRYLIC ACID AND TS ESTERS FROM AT LEAST ONE ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ISOBUTYRIC ACID AND ITS ESTERS BY THE DEHYDROGENTATION REACTION WITH SULFUR IS PROVIDED. THIS METHOD COMPRISES ADDING SAID ORGANIC COMPOUND TO THE REACTION SYSTEM TOGETHER WITH 0.3-70.0 GRAM ATOMS OF SULFUR VAPOUR AND AS A CATALYST, 0.5-30.0 MOLS OF HYDROGEN SULFIDE PER ONE MOL OF SAID ORGANIC COMPOUND AT A TEMPERATURE IN THE RANGE OF 400*-560*C.
Inventors
- 👤 M Chono
- 👤 N Matsuo
- 👤 H Nakajima
- 👤 M Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:23
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/377
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |