Patents by Inventor Larry M. Pettengill

Larry M. Pettengill 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).

  • Water filtration system for aquariums
    Patent number: 5011600
    Abstract: A water filtration system includes an auxiliary filter assembly having a single inlet connected to the water lift tube of an undergravel filter and an outlet connected to a submersible electric water pump which causes the water within an aquarium to flow through both the undergravel filter and auxiliary filter assembly before being recirculated back into the aquarium.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: April 30, 1991
    Assignee: Aquarium Systems, Inc.
    Inventors: Edmund J. Mowka, Jr., Thomas A. Frakes, Larry M. Pettengill