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:
Feb. 21, 2006
Filed:
Oct. 07, 2003
John Yaw Ofori, Niskayuna, NY (US);
Ben Purushotam Patel, Niskayuna, NY (US);
Eric James Pressman, East Greenbush, NY (US);
John Yaw Ofori, Niskayuna, NY (US);
Ben Purushotam Patel, Niskayuna, NY (US);
Eric James Pressman, East Greenbush, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method for preparing and isolating dihydroxybiaryl compounds, such as 4,4'-dihydroxybiphenyl, is disclosed. The alkali metal salt of the dihydroxybiaryl compound is protonated with the monohydroxyaryl halide compound initially used in the reductive coupling reaction which produced the alkali metal salt. In addition, the alkali metal salt of the monohydroxyaryl halide compound is produced by the process, which can then be recycled as the base and monohydroxyaryl halide in a further reductive coupling reaction to form the alkali metal salt of the dihydroxybiaryl compound.