Patents by Inventor Robert F. Check

Robert F. Check 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).

  • Domestic hot water zone valve controlled external coil
    Patent number: 4562956
    Abstract: A domestic hot water zone controlled external coil which takes heated water from the hot water outlet of a hydronic boiler and passes the hot water through a tankless coil before returning it to the hydronic boiler. Return water from the tankless coil is returned to the hydronic boiler by using the existing circulator on an existing operating heating zone, which saves electrical energy. An aquastat and a unique analysis and switching circuit is also provided.
    Type: Grant
    Filed: January 29, 1985
    Date of Patent: January 7, 1986
    Inventor: Robert F. Check