Aug 04, 2010. /Lesprom Network/. The Board of Directors of Koppers Holdings Inc. declared a quarterly dividend of $0.22 per common share, payable October 4, 2010, to stockholders of record as of the close of business on August 16, 2010. Koppers, with corporate headquarters and a research center in Pittsburgh, Pennsylvania, is a global integrated producer of carbon compounds and treated wood products.