Patents by Inventor Thomas P. Piston

Thomas P. Piston 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).

  • Method of forming an explosion proof contact assembly
    Patent number: 4261100
    Abstract: A method of making an explosion proof contact assembly and the resulting contact assembly are described wherein the electrical contacts are first rigidly mounted on a contact unit or sub-assembly prior to the molding operation. This approach allows complete assembly of the contacts prior to molding of the contact unit within the insulating body, while maintaining required flame path for explosion proof atmospheres. The present invention eliminates post-molding assembly operations which are extremely difficult and substantially raise the cost of producing the contact assemblies.
    Type: Grant
    Filed: June 5, 1979
    Date of Patent: April 14, 1981
    Assignee: Crouse-Hinds Company
    Inventor: Thomas P. Piston
  • Explosion-proof contact assembly and method of forming the same
    Patent number: 4213018
    Abstract: A method of making an explosion proof contact assembly and the resulting contact assembly are described wherein the electrical contacts are first rigidly mounted on a contact unit or subassembly prior to the molding operation. This approach allows complete assembly of the contacts prior to molding of the contact unit within the insulating body, while maintaining required flame path for explosion proof atmospheres. The present invention eliminates post-molding assembly operations which are extremely difficult and substantially raise the cost of producing the contact assemblies.
    Type: Grant
    Filed: June 6, 1978
    Date of Patent: July 15, 1980
    Assignee: Crouse-Hinds Company
    Inventor: Thomas P. Piston