Patents by Inventor R. Douglas Stone

R. Douglas Stone 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).

  • Interchangeable laryngeal blade
    Patent number: 4958624
    Abstract: A laryngeal blade assembly consisting of a metallic blade or spatula and two light assemblies that are selectively mounted on the blade. One light assembly has a fiber optic tube and a base block that with the blade will fit a fiber optic handle. The other light assembly has an incandescent bulb in the end of the light tube and a base block that with the blade fits an incandescent handle.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: September 25, 1990
    Assignee: Welch Allyn, Inc.
    Inventors: R. Douglas Stone, Thomas W. Turner