Patents by Inventor Douglas E. Hahn

Douglas E. Hahn 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: 6077137
    Abstract: An anti ingestion device for use with an engine, preferably a marine engine. The device comprises an exhaust manifold or riser system for exhausting engine gases, wherein the exhaust manifold has a first end and a second end, and the first end is connected to a cylinder head. There is a one-way pressure relief valve having a first end and a second end, wherein the first end is coupled to the exhaust manifold and the second end is exposed to atmospheric pressure. An air inlet line is coupled to the second end of the one-way pressure relief valve, such that the air inlet line serves as a conduit for guiding atmospheric pressure to the one-way pressure relief valve, thereby providing atmospheric pressure for passage into the exhaust manifold.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: June 20, 2000
    Assignee: Volvo Penta of the Americas, Inc.
    Inventor: Douglas E. Hahn
  • Patent number: 5188628
    Abstract: A closure device for connection to a fluid container which has an opening for receiving the device. The closure device has a base section which may sealably cover the container opening. The base section has a spike receiving opening passing there through with at least one air vent on the base section which is spaced from the spike receiving opening. A hydrophobic air filter, is associated with the air vent. Adjoining the base section is an internal cover, which lies over the aperture, covering it and the base section. The internal cover has a pierceable portion which is in alignment with the spike receiving opening of the base section.
    Type: Grant
    Filed: November 6, 1990
    Date of Patent: February 23, 1993
    Assignee: Sandoz Ltd.
    Inventors: Robert G. Rani, Douglas E. Hahn