Patents by Inventor David Emanuel Welch

David Emanuel Welch 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).

  • Luminescent golf ball
    Patent number: 5989135
    Abstract: The golf ball of the present invention has a white core which has a bright, white outer surface and a relatively thin, translucent cover composed of SURLYN.RTM. having a thickness of about 0.06 inches or less. The translucent SURLYN.RTM. cover contains between 6% and 12% by weight photostorage material, of the type having components such as aluminum oxide, strontium oxide, calcium oxide, europium oxide and boron oxide. A brightly colored fluorescent dye at a concentration between 0.01% and 0.04% by weight can also be added to a SURLYN.RTM. cover material to produce a golf ball of the present invention that is brightly colored. When the golf ball of the present invention has no fluorescent dye in its cover, it is substantially white in appearance, is visible in daylight and after being charged by exposure to light, emits a long lasting bright glow of light for high visibility in the dark.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: November 23, 1999
    Assignee: Night & Day Golf, Inc.
    Inventor: David Emanuel Welch