US3794567A
Expired / Lapsed
US
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Stabilization of unsaturated acids by distillation with a combined polymerization inhibitor
Assignee: Rohm and Haas Co
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Filing: 1972-01-06
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Granted: 1974-02-26
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Expires: 1992-01-06
Abstract
Abstract A PROCESS IS PROVIDED FOR INHIBITING POLYMERIZATION OF A POLYMERIzABLE UNSATURATED ACID SUCH AS ACRYLIC ACID, AND A PROCESS FOR STABILIZING DISTILLATION OF A POLYMERIZABLE UNSATURATED ACID SUCH AS ACRYLIC ACID, USING A COMBINATION OF POLYMERIZATION INHIBITORS, I.E., BENZOQUINONE AND HYDROQUINONE MONOMETHYL ETHER AND PREFERABLY WITH AIR (OR OXYGEN) PRESENT IN SPECIFIED AMOUNTS. THE PROCESS IS ALSO USEFUL WITH OTHER ACIDS SUCH AS METHACRYLIC ACID.
Inventors
- 👤 Susumu Otsuki
- 👤 Kyoichi Hori
- 👤 Isao Miyanohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:31
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38; C08F2/40; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/487; C07C51/50
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |