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. 26, 1998
Filed:
Dec. 17, 1996
Jimmy Lynn Webb, Ballston Lake, NY (US);
Matthew Hal Littlejohn, Green Island, NY (US);
Joseph John Caringi, Niskayuna, NY (US);
Thomas Link Guggenheim, Mt. Vernon, IN (US);
Robert Joseph Nick, Bergen op Zoom, NL;
Patrick Joseph McCloskey, Watervliet, NY (US);
Joseph Anthony King, Jr, Niskayuna, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Quaternary salts having a double helix structure are prepared by the reaction of dihydroxyaromatic compound, preferably a bisphenol, with an alkali metal hydroxide and a quaternary salt, such as a tetraalkylammonium or hexaalkylguanidinium chloride. The quaternary salts and their alkaline hydrolysis products are useful as catalysts in various reactions, including imide formation from bisphenol salts and halo- or nitro-substituted phthalimides and redistribution and equilibration of polycarbonates.