The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1976
Filed:
Nov. 14, 1973
Applicant:
Inventor:
Karl-Heinrich Meyer, Krefeld-Bockum, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
2606 / ; 2606 / ;
Abstract
A process for the production of very pure 2,2-bis-(4-hydroxy-3,5-dichlorophenyl)-propane (TCB), wherein a solution of TCB in an aromatic hydrocarbon is treated with hot water, followed by crystallization of TCB from the aqueous solution by addition of a halogenated aliphatic hydrocarbon.