Abrasion Resistant Patents (Class 352/238)
  • Systems and method for determining source of abrasion in film equipment
    Patent number: 6531696
    Abstract: Systems and method for determining a source of abrasion in film equipment by using a test film having fluorescent material thereon and illuminating the film equipment using a fluorescence creating light source to cause fluorescence of any part having fluorescent material deposited thereon by the test film.
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: March 11, 2003
    Inventor: John T. Pregent, Jr.
  • Format for color diffractive subtractive filters
    Patent number: 4094584
    Abstract: Each one of three filters, corresponding to different primary subtractive colors of a color picture, is embossed as a relief pattern on the same side of a plastic film within a separate one of any three of four side-by-side regions into which the film is divided. This permits the film to be thrice-folded to both (1) superimpose the three filters substantially in registration with each other and (2) place the embossed side of the film within the interior of the thrice-folded film where said filters are protected.
    Type: Grant
    Filed: April 14, 1977
    Date of Patent: June 13, 1978
    Assignee: RCA Corporation
    Inventor: William James Hannan