Abstract: A method of making a golf ball cover which, in order to increase the golf ball cover density, comprises adding to the cover materials which are in pelletized form nano-particles of a denser material of approximately 0.05 microns or less in size and the golf ball thus produced.

Abstract: A polar balanced putter is shown having a body made of readily castable material and having a high density material in the toe and head portions and a low density material in the center portion. Connected to the putter body by a joint bar is a hosel made from a high strength light weight material.

Abstract: A wood-type golf club head is provided with vertical grooves adjacent at each end of the ball hitting surface in order to enhance the desired gear effect when balls are hit on the toe and heel of the club.

Abstract: A golf putter with two reference lines on the top of the putter head and hosel and a reference indicator placed on the putter head below the hosel, all of which improves putting accuracy. The invention aids the golfer in positioning the golf ball in reference to the center of the face of the putter and properly positions the golfer's head and eyes directly above the putter. If the golfer's head and eyes are properly positioned over the putter, the reference lines on top of the putter and hosel will appear to be continuous and the reference indicator is not visible. However, if the golfer's head and eyes are not properly positioned above the putter, the reference lines appear to be discontinuous and/or the reference indicator is seen by the golfer.

Abstract: A golf club head made by brazing certain ceramic materials to certain metals by utilizing brazing alloys so as to provide, upon cooling, a compressively loaded component of the golf club head. The certain ceramic materials are joined to the certain metals by a brazing alloy.

Abstract: A method of making a golf club head or an insert for a golf club head and the product produced thereby which comprises preparing a porous base selected from the group consisting of metals, metal alloys, and cermets, and coating at least the face of said base with a plastic material.

Abstract: A method of making a golf club head by brazing certain ceramic materials to certain metals utilizes certain brazing alloys so as to provide upon cooling a compressively loaded component of said golf club head.

Abstract: The invention involves a golf club which has a ball striking surface with horizontally extending grooves on it in which the upper edges of the grooves are harder than the lower edges. The upper edges of the grooves on the ball striking surface are selectively made harder either by directional or non-directional surface treatment processes or by making them from materials which are harder than the materials from which the lower edges of the grooves are made.

Abstract: The invention involves golf club heads and a method of making golf club heads which comprises forming one or more components of the golf club head from sintered metal powders and then joining the components by welding, brazing, or diffusion or adhesive bonding to form a completed golf club head.