Patents Assigned to MacGregor Golf Company
  • Patent number: 7390267
    Abstract: A golf club head, particularly for putting, includes a main body having a leading section and a trailing section where the leading section has a top edge and a bottom edge and the trailing section has a top edge and a bottom edge. A sole portion interconnects the bottom edge of the leading section and the bottom edge of the trailing section. A heel portion and a toe portion each include a weight disposed therein. In addition, a third weight is disposed in the trailing section of the club. The weighting is such that the moment of inertia of the club head is increased over known putters.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: June 24, 2008
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: 7169057
    Abstract: An iron golf club head having a hollow interior. The iron golf club head is formed from a first casing and a second casing. The first casing includes the hosel and strike face, while the second casing includes the sole, the back side, and the topline of the iron golf club head. The second casing also includes two cavities, one of which forms the hollow interior of the iron golf club head when the first casing is welded to the second casing. The thickness and hardness of the first casing vary between the long and short iron golf club heads.
    Type: Grant
    Filed: January 28, 2004
    Date of Patent: January 30, 2007
    Assignee: MacGregor Golf Company
    Inventors: David A. Wood, James A. Bode
  • Publication number: 20060223653
    Abstract: A golf driver has a head which includes an alpha-beta titanium alloy body and a crown formed of a beta titanium plate which is thinner than the body and brazed to the body. The face of the club head comprises a variable-thickness beta titanium faceplate that is plasma welded to the body. Heat generated during the plasma welding causes the thin border region of the faceplate to become even more flexible to enhance the spacing action of the faceplate. Two weights are attached at the toe and heel, respectively, of the body to minimize twisting of the body during an off-center hit. Two additional weights are disposed in the sole of the body in locations causing the center of gravity to be displaced toward the heel and the back side of the club head. A graphite shaft of the driver has at least four sections of different stiffness, defining three bending points, to increase the flex action of the shaft and enable an oversized driver to return to an address position at the moment of impact.
    Type: Application
    Filed: December 5, 2005
    Publication date: October 5, 2006
    Applicant: MACGREGOR GOLF COMPANY
    Inventor: Yasuhiro Iizuka
  • Publication number: 20060217216
    Abstract: A fairway wood head comprises a stainless steel body and a cup-shaped titanium alloy face member attached by silver-nickel brazing to the body. The face member is preferably of variable thickness, being thicker at it's center than at it's outer periphery. Weights are attached at the toe and heel, respectively, of the body, to resist twisting of the head during an off-center hit. Weights are attached in the sole of the body on opposite sides of a front-to-rear center line of the head to lower the center of gravity of the head. The head has a hosel which includes a stainless steel inner portion and a titanium alloy outer sleeve portion disposed around and attached to the inner portion.
    Type: Application
    Filed: December 5, 2005
    Publication date: September 28, 2006
    Applicant: MACGREGOR GOLF COMPANY
    Inventor: Yasuhiro Iizuka
  • Patent number: 7048639
    Abstract: A golf putter head has a generally triangular shape where a ball-striking leading wall has a first breadth greater than a second breadth of a trailing wall. The leading wall and trailing wall are interconnected at their respective opposite ends by sidewalls that converge toward one another and define a cavity having a trapezoidal shape. The center of gravity of the golf putter head is closer to the trailing wall than the leading wall so that a moment of inertia is generated that reduces the effects of missing a sweet spot on the leading wall during a putt. In a second embodiment, the trailing wall is weighted to move the center of gravity still closer to the trailing wall. In a third embodiment, a web interconnects the leading and trailing walls along a longitudinal axis of the golf putter head, dividing the cavity into two equal-sized cavities.
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: May 23, 2006
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: 6929559
    Abstract: A golf putter head of triangular shape. A ball-striking leading wall has a first breadth greater than a second breadth of a trailing wall. The leading and trailing walls are interconnected at their respective opposite ends by sidewalls that converge toward one another and define a cavity of trapezoidal shape. The center of gravity of the golf putter head is closer to the trailing wall than the leading wall to provide a moment of inertia that reduces the effects of missing a sweet spot on the leading wall during a putt. In one embodiment, the trailing wall is weighted to move the center of gravity closer to the trailing wall. In another embodiment, a web interconnects the leading and trailing walls along a longitudinal axis of the golf putter head. Another embodiment adds a pair of weights to the leading end of each sidewall, significantly increasing the moment of inertia.
    Type: Grant
    Filed: June 2, 2003
    Date of Patent: August 16, 2005
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: 6896625
    Abstract: A golf putter head of triangular shape. A ball-striking leading wall has a first breadth greater than a second breadth of a trailing wall. The leading and trailing walls are interconnected at their respective opposite ends by sidewalls that converge toward one another. A web interconnects the leading and trailing walls along a longitudinal axis of the golf putter head. A first embodiment may include a trailing copper weight and side wall aluminum weights. A second embodiment may include three copper weights, a third embodiment may include three copper-tungsten weights, and a fourth embodiment may include three tungsten weights. The weights are removable so that a putter having a low swingweight or a high swingweight can be brought up to or down to a standard swingweight. The weights may also be mixed in the second, third, and fourth embodiments.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: May 24, 2005
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D503202
    Type: Grant
    Filed: January 28, 2004
    Date of Patent: March 22, 2005
    Assignee: MacGregor Golf Company
    Inventors: David A. Wood, James A. Bode
  • Patent number: D503762
    Type: Grant
    Filed: January 28, 2004
    Date of Patent: April 5, 2005
    Assignee: MacGregor Golf Company
    Inventor: David A. Wood
  • Patent number: D513776
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: January 24, 2006
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D518130
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: March 28, 2006
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D523107
    Type: Grant
    Filed: March 21, 2005
    Date of Patent: June 13, 2006
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D526376
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: August 8, 2006
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D528177
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: September 12, 2006
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D528616
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: September 19, 2006
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D529564
    Type: Grant
    Filed: March 21, 2005
    Date of Patent: October 3, 2006
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D575367
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: August 19, 2008
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D577781
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: September 30, 2008
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D578589
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: October 14, 2008
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace
  • Patent number: D596686
    Type: Grant
    Filed: September 16, 2008
    Date of Patent: July 21, 2009
    Assignee: MacGregor Golf Company
    Inventor: Robert M. Grace