Patents by Inventor Paul E. David

Paul E. David 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).

  • Heat retriever apparatus
    Patent number: 4369918
    Abstract: This device is a box unit, which is attached to the furnace exhaust, between the furnace and chimney. It consists primarily of a unit having, at its top, a reservoir containing fluid. Below the reservoir is an arrangement of tubing, through which the fluid is pumped, and exposed to extremely high temperatures. The unit further consists of a baffle, which causes the heat and exhaust fumes to pass upwards over the tubing, to surround the reservoir, and then downwards, and out of the chimney.
    Type: Grant
    Filed: May 28, 1980
    Date of Patent: January 25, 1983
    Inventors: Paul E. David, Leland M. Hyde