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:
Nov. 28, 2000
Filed:
May. 10, 1993
Gregory Breyta, San Jose, CA (US);
Daniel Joseph Dawson, San Jose, CA (US);
Moahmoud Mostafa Khojasteh, Wappingers Falls, NY (US);
Ranee Wai-Ling Kwong, Wappingers Falls, NY (US);
Elwood Herbert Macy, Hughsonville, NY (US);
David Paul Merritt, Cold Spring, NY (US);
Wayne Martin Moreau, Wappingers Falls, NY (US);
Stanley Eugene Perreault, Wappingers Falls, NY (US);
Harbans Singh Sachdev, Hopewell Junction, NY (US);
Robert Lavin Wood, Poughkeepsie, NY (US);
Hiroshi Ito, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A process for the stoichiometric carbonation of a hydroxyaromatic material is provided which comprises the steps of (a) mixing together in a reaction vessel (1) a hydroxyaromatic material, (2) a sufficient amount of a dialkyl dicarbonate to give the desired degree of substitution, (3) a catalytic amount of an unhindered tertiary amine, and (4) a solvent, (b) stirring the reaction mixture, (c) precipitating the alkyl carbonate of the hydroxyaromatic material, and (d) recovering the alkyl carbonate of the hydroxyaromatic material.