Patents by Inventor Sigurd A. Johnson

Sigurd A. 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).

  • Patent number: 4805073
    Abstract: A weather and tamper resistant multi-unit cable terminal box construction comprising a support structure for a terminal board adapted to be vertically positioned and mounted on a supporting wall, an enclosure or cover for covering and enclosing the front, top, and sides of said support structure; a hinge for moving said enclosure to open and closed position about a horizontal axis at the top of said support structure, said hinge being assembled by sidewise movement of the enclosure while in raised position along said horizontal axis, the sides of said support structure having spaced flanges for reception of side walls of said enclosure to enhance weather resistance of said box construction, said support structure having a bottom wall portion extending forwardly for slidably mounting cable pass-through plates and including a lock strike beam, said enclosure having a bottom wall portion extending rearwardly to abut said cable pass-through plates in closed position to lock said plates in position, the front wall
    Type: Grant
    Filed: February 2, 1988
    Date of Patent: February 14, 1989
    Assignee: Plan Hold Corporation
    Inventors: Sigurd A. Johnson, Howard C. Knott, Jerry A. Pederson
  • Patent number: 4508305
    Abstract: A locking device for infinitely varying the inclination of a drawing board mounted about a hinge axis along one edge of a base or table structure between a maximum tilt angle and a minimum angle such as horizontal in which a rod is pivotally connected at one end to a drawing board and extends downwardly alongside the base structure, a lock member is pivotally mounted on the base structure and has a plate portion having a hole therein to receive said rod, said hole having a configuration providing frictional contact with said rod surface in relative angular positions of the rod as determined by the inclination of the drawing board and by the pivotal movement of the lock member, the configuration of the hole maximizing such frictional contact, and a magnet on the base structure cooperable with said lock member to hold the lock member in release position with respect to the rod, the lock member being automatically disengaged from said magnet in one position of the drawing board.
    Type: Grant
    Filed: May 6, 1983
    Date of Patent: April 2, 1985
    Assignee: Plan Hold Corporation
    Inventors: Sigurd A. Johnson, Frank S. Avella, Robert I. Jones
  • Patent number: 4418378
    Abstract: A light box having one or more fluorescent light source tubes provided with light diffusing and mixing members of tubular form for modifying the light emitted by the fluorescent light tubes to provide a substantially uniformly illuminated backlighted work surface for use in tracing, stripping art work, and viewing color slides, photo negatives, and X-rays. The light box includes internal coated reflective surfaces on bottom and side walls. The light diffusing and mixing member includes light reflective interior and exterior coatings, shaped end portions and in one example perforations providing light transmitting openings. A light diffusing and mixing member of selected light translucent material having shaped end portions and arranged in accordance with the intensity of light emanating from the tubular fluorescent light source.
    Type: Grant
    Filed: March 5, 1981
    Date of Patent: November 29, 1983
    Assignee: Plan Hold Corporation
    Inventor: Sigurd A. Johnson
  • Patent number: 4303284
    Abstract: A multipositionable index file guide means adapted to be supported from laterally spaced support means for vertical filing of sheet material. In one example, the multipositionable index guide comprises a strip element having a longitudinal axis and longitudinal edge portions, each edge portion having a tab extending laterally with respect to the longitudinal axis and longitudinally offset with respect to the tab on the opposite edge portion. The strip element may be turned about its longitudinal axis for obtaining two tab upward positions in offset relation and may be turned about its lateral axis for obtaining a third upward position of one of said tabs. In another example, the index guide strip element includes a tab extending laterally from each longitudinal edge portion and in longitudinal offset relation, the strip element being adapted to be turned about its longitudinal axis to locate a tab in one of two upward positions.
    Type: Grant
    Filed: March 27, 1980
    Date of Patent: December 1, 1981
    Assignee: Plan Hold Corporation
    Inventor: Sigurd A. Johnson
  • Patent number: 4155607
    Abstract: A filing system for supporting material to be filed in vertical zones, such material being single sheet material, multiple sheet material held in a binder, vertically arranged horizontally extending pockets or compartments of single or multiple form. A support bar is positioned transversely of the vertical filing zones and supported at opposite ends, the support bar having a longitudinally extending web in a vertical plane normal to said vertical zone and having dihedrally disposed flanges extending from said web along its length in opposite directions. The flanges are shaped to provide upwardly facing bearing contact areas and downwardly facing bearing contact areas spaced from the vertical plane, each downwardly facing contact area being located to be cooperable with an upwardly facing contact area on the opposite side of the vertical plane to provide a set of bearing contact areas for supporting a suspension means connected to the material to be filed.
    Type: Grant
    Filed: February 16, 1978
    Date of Patent: May 22, 1979
    Assignee: Plan Hold Corporation
    Inventors: Richard W. Sitler, Sigurd A. Johnson