Patents by Inventor N. Leonard Pfeiffer

N. Leonard Pfeiffer 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: 4266693
    Abstract: A portable fuel and oil dispenser for servicing chain saws and other portable engine driven equipment, includes a compact carrier for side-by-side containers holding different fluids such as fuel and oil. Pump assemblies which effect fluid transfer during an upstroke thereof and have features causing a straight line lifting of a pump piston rod extend into each of the containers for fluid transfer therefrom and respectively include leak protection features such as relief ports for backflow of fluid from the pump assembly into the container when fluid transfer is not required. Flexible delivery conduits such as hoses are connected to the pump assemblies for dispensing the fluids and remote ends thereof have nozzles with a check valve at an extreme tip end to prevent seepage and dripping of the fluid from the nozzle. Further, to prevent inadvertent operation of the pump assemblies, handles therefor are foldable and collapse downwardly and out of the way against the containers.
    Type: Grant
    Filed: June 11, 1979
    Date of Patent: May 12, 1981
    Inventor: N. Leonard Pfeiffer