Patents by Inventor David U. Johnson

David U. Johnson 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).

  • Apparatus for calipering a collated assemblage
    Patent number: 5622268
    Abstract: An apparatus (10) comprises a movable member (60) having an outer circumferential surface which engages a collated assemblage (20) on a collating conveyor (14) to compress the collated assemblage when the member is moved towards the collated assemblage. A light source (36) directs light (37) toward the outer circumferential surface of the member. The outer circumferential surface includes a light reflective surface (83) portion against which the light is directed and then reflected. The reflected light (38) has a characteristic which varies as a function of the thickness of the collated assemblage. The reflected light is sensed and a first electrical signal (42) is provided which varies as a function of the characteristic of the reflected light and thus as a function of the thickness of the collated assemblage.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: April 22, 1997
    Assignee: Heidelberg Finishing Systems, Inc.
    Inventors: Charles J. Conner, Douglas P. Loughman, David U. Johnson