Patents Assigned to G.P.S. Co., Ltd.
  • Publication number: 20020045490
    Abstract: A hollow golf club head made of a metallic material. The golf club head has a three piece structure, a main head body, face, and crown. The main head body and the crown are formed by casting or press-forming, the face is formed by press-forming, and these are joined together by welding. The metallic material used is selected from a steel material group of martensite deposition hardening-type stainless steel, maraging steel, and maraging stainless steel. Only a material having a specific gravity of 7.7 or higher is used, and the head body has a volume of 280-320 cc and a weight of 180-205 g. The golf club head enables increasing the meet rate, has design freedom, exhibits excellent processability, and can be manufactured at a low cost.
    Type: Application
    Filed: November 2, 2001
    Publication date: April 18, 2002
    Applicant: G.P.S. CO., LTD.
    Inventors: Hiroyuki Ezawa, Toshiki Oonaka, Sadayoshi Furusawa, Shingo Nomura, Takashi Iihara
  • Patent number: 6334817
    Abstract: A hollow golf club head made of a metallic material. The golf club head has a three piece structure of a main head body, face and crown. The main head body and the crown are formed by casting or press-forming, the face is formed by press-forming, and these are joined together by welding. The metallic material used is selected from a steel material group of martensite deposition hardening-type stainless steel, maraging steel, and maraging stainless steel. Only a material having a specific gravity of 7.07 or higher is used, and the head body has a volume of 280-320 cc and a weight of 180-205 g. The golf club head enables increasing the meet rate, has design freedom, exhibits excellent processability, and can be manufactured at a low cost.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: January 1, 2002
    Assignee: G.P.S. Co., Ltd.
    Inventors: Hiroyuki Ezawa, Toshiki Oonaka, Sadayoshi Furusawa, Shingo Nomura, Takashi Iihara