When the principals of sportfisherman builder Post Yachts, of Mays Landing, N.J., filed for Chapter 7 bankruptcy a year ago, it looked as if the brand was to be consigned to history. But John Patnovic, owner of Worton Creek Marina and Boatyard in Chestertown, Md., and his family formed Post Marine Group and acquired the assets of Post Marine Co., vowing to build the full Post range at his facility in Chestertown. Terms of the deal weren’t disclosed.