Patents by Inventor Charles B. Jewison

Charles B. Jewison 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: 4969733
    Abstract: A portable foldable overhead projector includes a housing having a front opening communicating with an interior cavity, and a bottom aperture communicating with the cavity and closable by a pair of pivoting doors which, when open, support the housing on support legs and accommodate movement of a mirror inside the housing between stowed and use positions. In the use position the mirror reflects light from a source through a transmitting stage in the top wall of the housing which forms a pivoting door to provide further access to the cavity. A mast pivots along the outside of the housing and carries a foldable projection head assembly on a rack and pinion mechanism. When the mast is lowered the rack and pinion can be operated to move the folded projection head assembly through the front opening into the cavity for storage.
    Type: Grant
    Filed: October 2, 1989
    Date of Patent: November 13, 1990
    Assignee: Dukane Corporation
    Inventor: Charles B. Jewison
  • Patent number: 4331397
    Abstract: A filmstrip viewer/projector unit includes two separate projection lenses, one for front projection on a remote screen and the other for rear projection on a small local viewing screen built into the unit. A film carrier has two separate apertures therein respectively disposed in optical alignment with the two projection lenses for cooperation therewith to define first and second optical axes. A lamp directs a beam of light to a plane mirror disposed between the lamp and the film carrier and movable between two positions for respectively reflecting the beam of light along the first and second optical axes, respectively for projecting the film image onto the associated remote and local screens. First and second condenser lenses are respectively disposed along the optical paths between the reflector and the film carrier. The projection lenses share a common focusing mechanism.
    Type: Grant
    Filed: September 11, 1980
    Date of Patent: May 25, 1982
    Assignee: Dukane Corporation
    Inventors: Charles B. Jewison, Brian E. Buck
  • Patent number: D322264
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: December 10, 1991
    Assignee: Dukane Corporation
    Inventor: Charles B. Jewison