Hydrostream V-King YT Tunnel Patent

Howard Pipkorn from Arden Hills, Minn. files for a U.S. Patent for the Hydrostream V-King YT tunnel boat with a center vee-hull and sponsors on June 6, 1986. On June 16, 1987 he is awarded a continuation of Patent # 675533 from Nov. 28, 1984 on the Hydrostream design.