QUAKER OATS <OAT> SELLS VERNELL'S FINE CANDIES Quaker Oats Co said Keystone Partners Inc has purchased Vernell's Fine Candies Inc, previously an indirect subsidiary of Quaker. The price was not disclosed. It said Vernell's, based in Bellevue, Wash., had annual sales exceeding 30 mln dlrs. Vernell's was acquired by Quaker in its acquisition of Golden Grain Macaroni Co in August 1986.