US2959622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of crude jj-p-bis-
Assignee: —
•
Filing: —
•
Granted: 1960-11-08
•
Expires: 1977-11-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:32
CPC Classifications
C; C07; C07C; C07C39/00; C07C39/12; C07C39/15; C07C39/16; C07C37/00; C07C37/68; C07C37/685; C07C37/70; C07C37/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
PROCESS FOR THE PRODUCTION OF SUBSTANTIALLY PURE, SUBSTANTIALLY COLORLESS CRYSTALLINE, B-B-BIS-(4-HYDROXYPHENYL) PROPANE FROM THE CRUDE PHENOL AND WATER-CONTAINING PRODUCT OBTAINED BY THE CONDENSATION OF PHENOL WITH ACETONE WHICH COMPRISES NEUTRALIZING THE CRUDE PHENOLCONTAINING, WATER-CONTAINING PRODUCT, CONTACTING THE NEUTRALIZED PRODUCT WITH A WATER IMMISCIBLE ORGANIC SOLVENT IN WHICH THE B-B-BIS-(4-HYDROXYPHENYL) PROPANE IS SOLUBLE WHEN HEATED BUT SUBSTANTIALLY INSOLUBLE WHEN COOLED, AT AT ELEVATED TEMPERATURE SUFFICIENT TO DISSOLVE THE B-BBIS-(4-HYDROXYPHENYL) PROPANE AND AT LEAST A PORTION OF THE PHENOL, SEPARATING THE AQUEOUS LAYER WHICH FORMS, THEREAFTER COOLING THE HOT SOLUTION TO THEREBY CRYSTALLIZE B-B-BIS-(4-HYDROXYPHENYL) PROPANE THEREFROM AND RECOVERING THE PURE CRYSTALLINE B-B-BIS-(4-HYDROXYPHENYL) PROPANE.
Claim 2
Dependent Claim
101 words
PROCESS FOR THE PRODUCTION OF SUBSTANTIALLY PURE, SUBSTANTIALLY COLORLESS CRYSTALLINE, B-B-BIS-(4-HYDROXYPHENYL) PROPANE FROM THE CRUDE PHENOL AND WATER-CONTAINING PRODUCT OBTAINED BY THE CONDENSATION OF PHENOL WITH ACETONE WHICH COMPRISES NEUTRALIZING THE CRUDE PHENOLCONTAINING, WATER-CONTAINING PRODUCT, CONTACTING THE NEUTRALIZED PRODUCT WITH A WATER IMMISCIBLE ORGANIC SOLVENT IN WHICH THE B-B-BIS-(4-HYDROXYPHENYL) PROPANE IS SOLUBLE WHEN HEATED BUT SUBSTANTIALLY INSOLUBLE WHEN COOLED, AT AT ELEVATED TEMPERATURE SUFFICIENT TO DISSOLVE THE B-BBIS-(4-HYDROXYPHENYL) PROPANE AND AT LEAST A PORTION OF THE PHENOL, SEPARATING THE AQUEOUS LAYER WHICH FORMS, THEREAFTER COOLING THE HOT SOLUTION TO THEREBY CRYSTALLIZE B-B-BIS-(4-HYDROXYPHENYL) PROPANE THEREFROM AND RECOVERING THE PURE CRYSTALLINE B-B-BIS-(4-HYDROXYPHENYL) PROPANE.
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) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |