Patents Assigned to Jiro Hamada
  • Iron golf club heads, iron golf clubs and golf club evaluating method
    Publication number: 20020082119
    Abstract: A variety of novel clubheads and iron golf clubs with the novel heads are provided by reexamining the conventional views that iron golf clubs with a low center of gravity have good performance, and introducing a new criterion for evaluation to obtain iron golf clubs capable of sending the ball better distance. A clubhead includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with one of a hole, a hollow portion and a filling portion near the face forming portion.
    Type: Application
    Filed: September 25, 2001
    Publication date: June 27, 2002
    Applicant: Jiro Hamada
    Inventors: Jiro Hamada, Takaoki Ito
  • Iron golf club heads, iron golf clubs and golf club evaluating method
    Patent number: 6368232
    Abstract: A variety of novel club heads and iron golf clubs with the novel heads are provided by reexamining the conventional views that iron golf clubs with a low center of gravity have good performance, and introducing a new criterion for evaluation to obtain iron golf clubs capable of sending the ball better distance. A club head includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with one of a hole, a hollow portion and a filling portion near the face forming portion.
    Type: Grant
    Filed: April 18, 2000
    Date of Patent: April 9, 2002
    Assignee: Jiro Hamada
    Inventors: Jiro Hamada, Takaoki Ito
  • Iron golf club heads, iron golf clubs and golf club evaluating method
    Patent number: 6086485
    Abstract: A variety of novel clubheads and iron golf clubs with the novel heads are provided by reexamining the conventional views that iron golf clubs with a low center of gravity have good performance, and introducing a new criterion for evaluation to obtain iron golf clubs capable of sending the ball better distance. A clubhead includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with one of a hole, a hollow portion and a filling portion near the face forming portion.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: July 11, 2000
    Assignee: Jiro Hamada
    Inventors: Jiro Hamada, Takaoki Ito