Aug 07, 2012. /Lesprom Network/. The Board of Directors of Koppers Holdings Inc. declared a quarterly dividend of $0.24 per common share, payable October 9, 2012, to stockholders of record as of the close of business on August 20, 2012, as the company said in the press release received by Lesprom Network. 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, The Netherlands, Australia and China.