Patents by Inventor Russell P. Irwin

Russell P. Irwin 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).

  • Patent number: 4346968
    Abstract: A visual field testing unit having a thin, light-weight screen adapted for mounting on an inside building wall and having a plurality of individually energizable substantially point light sources across its surface but behind a semi-transparent screen so that the lights are not visible from the outside until lit. A hand-held control unit allows a practitioner to test the visual field of a patient sitting a distance from the wall that carries the screen. The practitioner sequences various light patterns according to automatic preprogrammed patterns and duration of energization.
    Type: Grant
    Filed: February 4, 1980
    Date of Patent: August 31, 1982
    Assignee: Pacific Innovations
    Inventors: John A. Melin, Russell P. Irwin, Gordon L. Epstein