List of Patents Issued Last Week to Northwestern Inventors.Reported by Lothrop Johnson, patent lawyers, 911 Pioneer Press building, St. Paul, Minn.: Albert J. Hughes, St. Anthony Park, Minn., envelope; Abner Johnson, Strandqulst, Minn., animal trap; John W. Nilsson,. Balfour, N. D., cultivator; Frank A. P.oweckamp, Wltaka, Minn., hay-baler; Knute S. Satre, Frost, Minn., shock-loader; William F. St. Clair, Owaton-na, Minn., display stand; Robert R.. Ticlienor; Feely, Minn., grain door.