International Paper declared a quarterly dividend of $0.40 per share for the period from July 1, 2015, to September 30, 2015, inclusive, on its common stock, par value $1.00. This dividend is payable on Sept. 15, 2015, to holders of record at the close of business on Aug. 14, 2015.   The company also declared a regular quarterly dividend of $1.00 per share for the period from July 1, 2015, to Sept. 30, 2015, inclusive, on the cumulative $4.00 preferred stock of the company. This dividend is al...