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:
Dec. 10, 2002
Filed:
Jan. 19, 2000
Applicant:
Inventors:
Anand Pal Singh, Pune, IN;
Sharda Dagade, Pune, IN;
Assignee:
Council of Scientific and Industrial Research, New Delhi, IN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 3/912 ;
U.S. Cl.
CPC ...
C07C 3/912 ;
Abstract
The present invention discloses an improved process for the preparation of dihydroxydiphenylmethanes by reacting phenol over a microporous alumino-silicate zeolite catalyst composite material in the presence of a condensing agent and a solvent at a temperature in the range of 5 to 200° C. for a period between 0.1 to 24 hours at autogeneous pressure and separating the dihydroxydiphenylmethanes by any conventional method.