Patents by Inventor Peter J Cunningham

Peter J Cunningham 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).

  • Light-filter for dental use
    Patent number: 5509800
    Abstract: A light filter for dental use having a transparent planar member (12) which is colored so as to filter-out visible radiation in the range 400 nm to 520 nm, the range being that to which dental composite materials are sensitive, the filter being arranged to be fitted in front of a dental lamp by means of an attachment device (114) arranged to detachably secure the transparent planar member (12) to the dental lamp.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: April 23, 1996
    Inventors: Peter J Cunningham, Raymond A. Leggo