Patent US3649684A successfully refreshed from Google Patents.
US3649684A
Expired / Lapsed
US
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Process for the preparation of methacrylic acid
Assignee: Nippon Shokubai Co Ltd
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Filing: 1969-07-25
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Granted: 1972-03-14
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Expires: 1989-07-25
Abstract
Abstract A PROCESS FOR THE PREPARATION OF METHACRYLIC ACID, WHICH COMPRISES CATALYTICALLY REACTING METHACROLEIN WITH MOLECULAR OXYGEN AT ELEVATED TEMPERATURES IN A VAPOR PHASE, IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF (A) MOLYBDENUM, (B) PALLADIUM OR PLATINUM, (C) ARSENIC (D) OXYGEN AS THE ESSENTIAL COMPONENTS, AND ANY OF (E) PHOSPHORUS, BORON OR SILICON AS AN OPTIONAL COMPONENT.
Inventors
- 👤 Shinichi Akiyama
- 👤 Shoichiro Minami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:23
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |