Patents by Inventor Robert K. Stephens

Robert K. 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: 4710426
    Abstract: Radiation-control sheet materials are disclosed, these materials including a transparent support material, an infrared radiation-reflecting layer and a protective polymeric layer therefor substantially transmissive of infrared radiation and having therein or in a layer contiguous thereto an adhesion-promoting isocyanate. The protective polymer layer provides anti-abrasion and anti-corrosion protection and is effectively bonded by the adhesion-promoting isocyanate.
    Type: Grant
    Filed: November 28, 1983
    Date of Patent: December 1, 1987
    Assignee: Polaroid Corporation, Patent Dept.
    Inventor: Robert K. Stephens
  • Patent number: 4588171
    Abstract: A shock absorber and air spring assembly particularly adapted for use in a tilt cab suspension system. It provides the capability of remotely adjusting the amount of damping on the down stroke of the damper piston.
    Type: Grant
    Filed: December 18, 1981
    Date of Patent: May 13, 1986
    Assignee: Applied Power Inc.
    Inventor: Robert K. Stephens
  • Patent number: 4186005
    Abstract: This invention is directed to a film unit composed of a support carrying on one side a processing composition permeable layer containing an acid reacting reagent therein, and, on the other side, silver precipitating nuclei and photosensitive silver halide crystals. The above film unit is particularly suitable for use as motion picture film, i.e., in the form of an elongated web wherein said film unit is unwound, exposed, contacted with a photographic processing composition containing, e.g., a silver halide developing agent and silver halide solvent, rolling said film unit upon itself thereby contacting the processing composition permeable layer with the layers on the opposite side of the support. The acid reacting agent will diffuse into the silver halide and nuclei containing layers providing enhanced stability to the film unit.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: January 29, 1980
    Assignee: Polaroid Corporation
    Inventors: Richard J. Haberlin, Robert K. Stephens
  • Patent number: 4139382
    Abstract: A photographic sound recording and reproduction method is disclosed wherein a sound track is formed by silver diffusion transfer processing. Film units suitable for this application are described which comprise a support, a layer containing silver precipitating nuclei, and a layer containing photosensitive silver halide crystals.In one embodiment, a photographic sound track may be produced in a silver diffusion transfer color motion picture film unit, which further comprises an optical color screen.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: February 13, 1979
    Assignee: Polaroid Corporation
    Inventor: Robert K. Stephens
  • Patent number: 4057126
    Abstract: A lubricant wiper of the type used to wipe lubricant from a rotating member has a curved wiping surface and is pivotally mounted adjacent to the rotating member in such a manner that the curved wiping surface of the wiper is maintained by gravity in contact with the side of said rotating member to wipe lubricant therefrom. In the preferred embodiment, the wiper is pivotally mounted on a support and has a center of gravity to the opposite side of the pivot point from the curved wiping surface. The support also carries a trough to collect and transport the lubricant wiped from the rotating member.
    Type: Grant
    Filed: March 25, 1976
    Date of Patent: November 8, 1977
    Assignee: The Falk Corporation
    Inventor: Robert K. Stephens
  • Patent number: 4047804
    Abstract: Transparent elements useful as supports for photographic image-carrying and/or image-recording layers are provided comprising a polymeric film base having an anti-reflection coating on one surface. Image-carrying and/or image-recording layers may be coated on the opposed surface. Such transparent supports are particularly useful in photographic products wherein the final image is formed by multicolor diffusion transfer processes using dye developers or other image dye-providing materials. In the preferred embodiments, the photographic image is an integral negative-positive reflection print. Where photoexposure is effected through a transparent support, e.g., the transparent support through which the final image is viewed, provision of an anti-reflection coating on said support and effecting photo-exposure therethrough will permit more effective recording of light passing through the camera lens.The polymeric film base of the transparent element has an index of refraction of at least 1.
    Type: Grant
    Filed: November 29, 1974
    Date of Patent: September 13, 1977
    Assignee: Polaroid Corporation
    Inventor: Robert K. Stephens