US2497503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of substituted phenols
Assignee: Libbey Owens Ford Glass Co
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Filing: 1946-03-07
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Granted: 1950-02-14
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Expires: 1966-03-07
Abstract
No abstract record available.
Inventors
- 👤 Jones John Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:30
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/50; C07C37/52; C07C37/11; C07C37/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
IN A METHOD OF PREPARING PHENOLS HAVING UNSATURATED SUBSTITUENTS THAT COMPRISES (1) CONDENSING TWO MOLECULES OF PHENOL IN THE PRESENCE OF AN ACID CATALYST WITH ONE MOLECULE OF A KETONE OF THE CLASS CONSISTING OF CYCLOHEXANONE AND ALKYL METHYL KETONES IN WHICH THE ALKYL RADICALS CONSIST OF PRIMARY AND SECONDARY NORMAL ALKYL RADICALS HAVING FROM ONE TO FIVE CARBON ATOMS, (2) HEATING THE CONDENSATION PRODUCT TO A TEMPERATURE AT WHICH PYROLYSIS OCCURS TO PRODUCE A PHENOL HAVING AN UNSATURATED SUBSTITUENT AND (3) DISTILLING OFF THE SUBSTITUTED PHENOL, THE STEP OF, PRIOR TO PYROLYZING, ADDING TO THE CONDENSATION PRODUCT A STRONG ALKALI METAL BASE IN AN AMOUNT IN EXCESS OF THE EQUILVALENT OF THE ACID CATALYST REMAINING IN THE CONDENSATION PRODUCT, WHEREBY THE SUBSTITUTED PHENOL IS DISTILLED WITHOUT SUBSTANTIAL POLYMERIZATION.
Claim 2
Dependent Claim
129 words
IN A METHOD OF PREPARING PHENOLS HAVING UNSATURATED SUBSTITUENTS THAT COMPRISES (1) CONDENSING TWO MOLECULES OF PHENOL IN THE PRESENCE OF AN ACID CATALYST WITH ONE MOLECULE OF A KETONE OF THE CLASS CONSISTING OF CYCLOHEXANONE AND ALKYL METHYL KETONES IN WHICH THE ALKYL RADICALS CONSIST OF PRIMARY AND SECONDARY NORMAL ALKYL RADICALS HAVING FROM ONE TO FIVE CARBON ATOMS, (2) HEATING THE CONDENSATION PRODUCT TO A TEMPERATURE AT WHICH PYROLYSIS OCCURS TO PRODUCE A PHENOL HAVING AN UNSATURATED SUBSTITUENT AND (3) DISTILLING OFF THE SUBSTITUTED PHENOL, THE STEP OF, PRIOR TO PYROLYZING, ADDING TO THE CONDENSATION PRODUCT A STRONG ALKALI METAL BASE IN AN AMOUNT IN EXCESS OF THE EQUILVALENT OF THE ACID CATALYST REMAINING IN THE CONDENSATION PRODUCT, WHEREBY THE SUBSTITUTED PHENOL IS DISTILLED WITHOUT SUBSTANTIAL POLYMERIZATION.
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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |