Patents by Inventor James M. Handzel

James M. Handzel 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).

  • Swimming pool water circulation system
    Patent number: 4503573
    Abstract: A swimming pool water circulation system having a two-state valve which is alternately operated for predetermined lengths of time in a first state wherein water flow through the system is at a relatively low pressure high volume flow rate for efficient water filtration and in a second state wherein the water flows through the system to a pool cleaning device or system at a relatively high pressure low volume flow rate for efficient operation of the pool cleaning system or device.
    Type: Grant
    Filed: July 11, 1983
    Date of Patent: March 12, 1985
    Inventor: James M. Handzel