Patents by Inventor Karl Hoeft

Karl Hoeft 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: 4179210
    Abstract: Apparatus for developing latent electrostatic images on dielectric carrier sheets has a rotary cylinder whose periphery supports a carrier sheet with a latent image thereon, and a metallic block having a concave surface which constitutes a grounded electrode and defines with the exposed side of the carrier sheet on the cylinder a narrow gap of constant or gradually decreasing width, as considered in the direction of rotation of the cylinder. The block has alternating fluid-admitting and fluid-evacuating orifices which communicate with the gap and extend transversely of the path of movement of the carrier sheet. Each fluid-admitting orifice is nearer to the preceding than to the next-following fluid-evacuating orifice, and the width of the fluid-evacuating orifices exceeds the width of the fluid-admitting orifices. The block is located below the cylinder and the fluid-evacuating orifices communicate with a collecting tank into which spent developing fluid flows by gravity.
    Type: Grant
    Filed: September 26, 1977
    Date of Patent: December 18, 1979
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Friedrich Bestenreiner, Dieter Giglberger, Karl Hoeft, Robert Kohler