US2799715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dihydric phenols
Assignee: Hercules Powder Co
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Filing: 1954-11-03
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Granted: 1957-07-16
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Expires: 1974-11-03
Abstract
No abstract record available.
Inventors
- 👤 Arthur D Lohr
- 👤 Milton A Taves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:13
CPC Classifications
C; C07; C07C; C07C409/00; C07C409/02; C07C409/04; C07C409/08; C07C37/00; C07C37/01; C07C37/055; C07C37/0555; C07C407/00; C07C409/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
THE METHOD OF PRODUCING A DIHYDRIC PHENOL OF THE GROUP CONSISTING OF RESORCINOL AND HYDROQUINONE WHICH COMPRISES CONTACTING AN ISOPROPYLPHENYL P-TOLUENESULFONATE IN WHICH THE ISOSPROPYL GROUP IS IN ONE OF THE POSITIONS META ANAD PARA, WITH AN OXYGEN CONTAINING GAS AT A TEMPERATURE IN THE RANGE OF ABOUT 20*C. TO ABOUT 125*C. IN THE PRESENCE OF AN ANTACID UNTIL THERE IS FORMED THE CORRESPONDING A-HYDROPEROXYISOPROPYLPHENYL P-TOLUENESULFONATE, SUBSEQUENTLY CONTACTING SAID HYDROPEROXY ESTER WITH AN ACIDIC HYDROPEROXIDE CLEAVAGE CATALYST UNTIL THERE IS FORMED THE HYDROXYPHENYL ESTER AND HYDROLYZING THE HYDROXYPHENYL, ESTER TO THE CORRESPONDING DIHYDRIC PHENOL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |