Patents by Inventor William F. Feldmann

William F. Feldmann 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).

  • Patent number: 4117883
    Abstract: A heat retriever having a shell provided with an inlet and an outlet for permitting a fluid to be circulated through the shell and heated by a retriever assembly including a vent pipe attachable to a flue pipe of a furnace. At least one, and preferably a plurality of retriever pipes are connected in parallel to the vent pipe within the shell for forming a bypass around a portion of the vent pipe of exhaust gas from the associated furnace flue pipe and exposing the fluid to be heated to a larger heat transfer surface. A blower is advantageously mounted on the inlet of the shell in order to provide a flow of forced air over the retriever pipes.
    Type: Grant
    Filed: August 30, 1976
    Date of Patent: October 3, 1978
    Inventor: William F. Feldmann
  • Patent number: 4042210
    Abstract: An adjustable leverage pry tool having a lever including a handle portion and a pry portion connected to the handle portion and in the form of an arcuate plate provided with a claw. Mounted on the pry portion is a fulcrum member which is movable along the arcuate plate between the claw and the handle portion for varying the angle and amount of leverage exerted by the lever. The cross section of the fulcrum member is elliptical and has its longest axis disposed at an acute angle with respect to the arcuate plate in order to enhance the leverage of the tool.
    Type: Grant
    Filed: June 29, 1976
    Date of Patent: August 16, 1977
    Inventor: William F. Feldmann