Feb 09, 2007. /Lesprom Network/. The board of directors of Koppers Holdings Inc. declared on February 7 a quarterly dividend of $0.17 per common share, payable April 2, 2007, to stockholders of record as of the close of business on February 28, 2007. Koppers, with corporate headquarters and a research center in Pittsburgh, Pennsylvania, is a global integrated producer of carbon compounds and treated wood products.