Patents by Inventor Donald Steven Rahrig

Donald Steven Rahrig has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Perimeter weighted iron type golf club head with multiple level weight pads
    Patent number: 6120388
    Abstract: A golf club head set having the club head back side divided into four areas, including the perimeter weighted region A; the sweet spot area B located directly behind the ball, two non-striking areas C, and the low central region D. The sweet spot area is further divided into three distinct weight levels, and the low central region has been divided into four additional weight levels. By adding and drooping weight levels as well as by changing the thickness of the levels, the weight distribution of each club head is changed to control center of gravity and polar movement of inertia and provide gradated performance specific to each club head.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: September 19, 2000
    Assignee: Spalding Sports Worldwide, Inc.
    Inventors: Robert Thomas Blough, Ronie Foy McGraw, Donald Steven Rahrig
  • Perimeter weighted iron type golf club heads with multiple level weight pads
    Patent number: 5921869
    Abstract: A golf club head set having the club head back side divided into four areas, including the perimeter weighted region A; the sweet spot area B located directly behind the ball striking area, two separated non-striking areas C, and the low central region D. The sweet spot area B is further divided into three distinct weight levels, and the low central region D is divided into four additional weight levels. By adding and dropping weight levels as well as by changing the thickness of the levels, the weight distribution of each club head is changed so as to control center of gravity and polar moment of inertia and provide gradated performance specific to each club head in the set.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: July 13, 1999
    Assignee: Lisco, Inc.
    Inventors: Robert Thomas Blough, Ronie Foy McGraw, Donald Steven Rahrig