Patents by Inventor Doug A. Danforth

Doug A. Danforth 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).

  • Air register filtering system
    Patent number: 5947815
    Abstract: An air register filtering system for mounting to an existing air register thereby removing particles of dust, pollen and other debris that do not get trapped by a furnace filter before being blown into the room providing cleaner air for the user and reducing the need for dusting. The system includes an air register a filter retaining structure engaging the existing air register, and a filter secured within the filter retaining structure.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: September 7, 1999
    Inventor: Doug A. Danforth