Patents by Inventor Horst Stief

Horst Stief 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).

  • Slide-screen for back projection
    Patent number: 4364635
    Abstract: A slide-screen for back projection has a standing and/or suspended frame (1) and a projection surface arranged within it. The projection surface is made double-skinned and consists of a plastics or similar translucent partition (3), which allows through light rays (5) coming from a reflector (4), and a natural or synthetic glass viewing screeen (2) which reflects the impinging light rays (5) in the direction of the translucent partition (3) preventing dissipation of the light.
    Type: Grant
    Filed: June 12, 1981
    Date of Patent: December 21, 1982
    Inventor: Horst Stief