Patents by Inventor William Witkowski

William Witkowski 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).

  • Plastic baseball bat and method of making the same
    Patent number: 4541629
    Abstract: An injection molded baseball bat with a core of thermoplastic plus a blowing agent and a solid skin of thermoplastic per se injected into the mold at one and the same time. The skin and core may be of the same or of different thermoplastic. The baseball bat is a unitary structure of superior strength and finish with the foamed core and solid skin fused together.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: September 17, 1985
    Inventor: William Witkowski
  • Plastic bowling pin and method of making the same
    Patent number: 4457511
    Abstract: An injection molded bowling pin with a core of thermoplastic plus a blowing agent and a solid skin of thermoplastic per se injected into the mold at one and the same time. The bowling pin is molded by a process wherein a foam material for forming the core is surrounded by and in contact with a nonfoam material and both materials are simultaneously injected into a mold cavity having the shape of a bowling pin. The skin and core may be of the same or of different thermoplastic. The bowling pin is a unitary structure of superior strength and finish with the foamed core and solid skin fused together.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: July 3, 1984
    Inventor: William Witkowski
  • 8-way adaptor
    Patent number: D673914
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: January 8, 2013
    Assignee: John Mezzalingua Associates, Inc.
    Inventor: William Witkowski