Patents by Inventor Loren Liedl

Loren Liedl 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).

  • Filtered cold air baseboard return
    Patent number: 5176570
    Abstract: A filtered cold air return register particularly for base board units which provides for a removable replacement filter section in combination with the normally provided duct covering or end section. The unit provides a filter device for the return air prior to its recycling by the furnace or air conditioning fan.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: January 5, 1993
    Inventor: Loren Liedl