Patents by Inventor Martha D. Gregory

Martha D. Gregory 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).

  • Picture holder
    Patent number: 4203239
    Abstract: A picture holding device injection molded of clear plastic is provided wherein a plurality of profile shapes with opposing channels are interconnected so as to allow a number of transparent picture holding sleeves to be inserted in the channels. The channels are separated horizontally and vertically so as to provide an essentially unobstructed view of each picture by merely changing the viewing angle.
    Type: Grant
    Filed: July 25, 1977
    Date of Patent: May 20, 1980
    Inventors: Alice J. Williams, Martha D. Gregory