Patents by Inventor Donn E. Stephens

Donn E. Stephens 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: 4426140
    Abstract: A compact refraction instrument for use in both the objective and subjective examination of human eyes. The instrument incorporates an alignment mode, a retinoscopy mode, a distance mode and near mode. For carrying out the functions associated with these modes, the instrument includes a Brewster stereoscope, a mode change system, and a system for supporting a plurality of binocular/monocular vision testing slides. The instrument also includes a refractor system and apparatus for suspending the refractor system in the optical paths before the Brewster stereoscope. The refractor suspension system includes a frame support, a refractor support plate, an apparatus secured between the frame and refractor support plate for pivoting the refractor support plate about an axis substantial coincident with an axis in the plane of and centered between the two optical axes of the refractor.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: January 17, 1984
    Assignee: Bausch & Lomb Incorporated
    Inventor: Donn E. Stephens