Aug 06, 2008. /Lesprom.com/. The Board of Directors of Koppers Holdings Inc. declared a quarterly dividend of $0.22 per common share, payable October 2, 2008, to stockholders of record as of the close of business on August 18, 2008. Koppers is a global integrated producer of carbon compounds and treated wood products. Including its joint ventures, Koppers operates facilities in the United States, United Kingdom, Denmark, Australia and China.