Dunkin' Brands Group Inc. released approximation terms on Monday for their planned initial public offering. The company plans to sell about 22 million shares and an approximate deal that would price at $16 to $18 a share. In May, Dunkin' was expecting to sell at least $400 million in stock.During 2005, a trio of private-equity firms took the company private for $2.4 billion in cash.Dunkin Brands plans to use the profits to pay off debt and for working capital and general corporate purposes, according to a filing with the Securities and Exchange Commission. It plans to trade on the Nasdaq Global Select Market under the ticker DNKN.