Patents by Inventor Nathan R. Cooper

Nathan R. Cooper 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).

  • Filter with change indicator
    Patent number: 8021618
    Abstract: A filter change indicator is provided and includes a fragrance and auditory emission apparatus adapted to be installed in disposable-type air filters utilized to remove contaminants carried along in the air stream of HVAC systems. The fragrance and auditory emission apparatus functions to emit a shrill tone or whistling noise when the air filter becomes dirty or clogged. The fragrance and auditory emission apparatus also functions as an air freshener or a room deodorizer.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: September 20, 2011
    Inventor: Nathan R. Cooper