Nov 06, 2012. /Lesprom Network/. The Board of Directors of Koppers Holdings Inc. declared a quarterly dividend of $0.24 per common share, payable January 7, 2013, to stockholders of record as of the close of business on November 19, 2012, as the company said in the press release received by Lesprom Network. Koppers, with corporate headquarters and a research center in Pittsburgh, Pennsylvania, 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.