Patents Assigned to Nojimagumi Co., Ltd.
  • Sand-blasting abrasive materials and method of producing the same
    Patent number: 4333743
    Abstract: Method of producing sand-blasting abrasive materials, and the materials so produced, consisting of silica sand and/or slag, coated with a thermosetting resin by heat treatment, and the coating being then rendered unsoluble and unmeltable, by subsequent, separate heat treatment. The resin may contain a catalyst.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: June 8, 1982
    Assignee: Nojimagumi Co., Ltd.
    Inventor: Nobuo Nojima