Patents by Inventor Theodoor Hillebrand Linthout

Theodoor Hillebrand Linthout 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).

  • Process and apparatus for controlling the concentration of diazotype developing liquid
    Patent number: 4024885
    Abstract: A reserve supply of diazotype developing liquid from which liquid is supplied to semi-dry diazotype developing apparatus is maintained at both a substantially constant level and the required concentration of azo coupling component by introducing solvent for the liquid to restore the liquid level upon a decrease of the supply volume, sensing the specific gravity of the supply liquid by a hydrometer, and counteracting the decrease of concentration resulting from solvent addition by introducing a liquid concentrate containing the azo coupling component and electrolyte in response to a lowering of the hydrometer.
    Type: Grant
    Filed: September 4, 1974
    Date of Patent: May 24, 1977
    Assignee: Oce-van der Grinten N.V.
    Inventor: Theodoor Hillebrand Linthout