Patent US2802877A successfully refreshed from Google Patents.
US2802877A
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Preparation of omicron, omicron'-thiodiphenol
Assignee: Dow Chemical Co
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Filing: 1954-07-08
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Granted: 1957-08-13
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Expires: 1974-07-08
Abstract
No abstract record available.
Inventors
- 👤 Houtman Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:20
CPC Classifications
C; C07; C07C; C07C323/00; C07D; C07D327/00; C07D327/02; C07D327/06; C07D327/08; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD FOR THE PREPARATION OF O,O''-THIODIPHENOL WHICH COMPRISES HEATING A MIXTURE CONSISTING ESSENTIALLY BY WEIGHT, OF ABOUT 27 PERCENT PHENOTHIOXIN, ABOUT 30 PERCENT POTASSIUM HYDROXIDE, ABOUT 5 PERCENT WATER AND ABOUT 38 PERCENT METHANOL AT A TEMPERATURE OF ABOUT 195*C. WITH AGITATION AT AUTOGENOUS PRESSURE FOR ABOUTT THREE HOURS, THEREAFTER ACIDIFYING THE REACTION MIXTURE AND SEPARATING THEREFROM O,O''-THIODIPHENOL.
Claim 2
Independent Claim
59 words
A METHOD FOR THE PREPARATION OF O,O''-THIODIPHENOL WHICH COMPRISES HEATING A MIXTURE CONSISTING ESSENTIALLY BY WEIGHT, OF ABOUT 27 PERCENT PHENOTHIOXIN, ABOUT 30 PERCENT POTASSIUM HYDROXIDE, ABOUT 5 PERCENT WATER AND ABOUT 38 PERCENT METHANOL AT A TEMPERATURE OF ABOUT 195*C. WITH AGITATION AT AUTOGENOUS PRESSURE FOR ABOUTT THREE HOURS, THEREAFTER ACIDIFYING THE REACTION MIXTURE AND SEPARATING THEREFROM O,O''-THIODIPHENOL.
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) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |