Patents by Inventor Joseph M. Haggerty

Joseph M. Haggerty 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: 5576854
    Abstract: In a liquid crystal light valve projector, a quarter-wave compensator plate is disposed between a polarization plate and a liquid crystal light valve to compensate for polarization irregularities induced by the off-incident reflections in the cone of light projected onto the LCLV. The quarter-wave compensation plate reverses the phase of the P component of said illumination light with respect to said compensator plate by 180.degree. thereby eliminating P-polarization leakage during the dark state of an LCLV projector. The invention also combines the compensator plate with a heat shield and a low stress-optical coefficient counter electrode substrate to reduce the birefringence of the LCLV thereby also minimizing leakage of P-polarized light onto the projection screen during the dark state of the projector.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: November 19, 1996
    Assignee: Hughes-JVC Technology Corporation
    Inventors: Jack H. Schmidt, Ned Nestorovic, Rodney D. Sterling, Joseph M. Haggerty, Javier A. Ruiz, Robert Edwards, Roger Hollister
  • Patent number: 5179425
    Abstract: A hand held instrument for measuring roughness of a surface, such as the "orange peel" on a painted surface, employs a scanning disc (42) which mounts a light source (56) to project a light beam at the surface being measured in a circular scan pattern. Light reflected from the surface is received by a sensor (90) which produces an output electrical signal having an amplitude and frequency that follow the amplitude and frequency of reflected light received by the sensor. Electrical signals representing amplitude and frequency are suitably combined (134) to provide an output display (114) that reads the value of orange peel according to a set of values determined by calibration of the instrument from a set of calibration panels.
    Type: Grant
    Filed: August 7, 1991
    Date of Patent: January 12, 1993
    Assignee: Hughes Aircraft Company
    Inventors: Stephen J. Reinsch, Joseph M. Haggerty