Patents by Inventor Thomas D. Hadnagy

Thomas D. Hadnagy 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).

  • Multi-line chemical injection system
    Patent number: 3942082
    Abstract: A multi-line chemical injection system for injecting chemicals into two or more independent systems including a pressure tank, a pump to supply chemicals to the pressure tank, a pressure control switch to regulate the pressure within the pressure tank and a plurality of cam operated solenoid valves to regulate chemical injection from the pressure tank.
    Type: Grant
    Filed: June 24, 1974
    Date of Patent: March 2, 1976
    Inventor: Thomas D. Hadnagy