Patents by Inventor Kurt Albrecht Wehlmann

Kurt Albrecht Wehlmann 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 replenishing developer in photoprinting machines
    Patent number: 4023193
    Abstract: A process for replenishing developing medium in a developing chamber of a photoprinting machine and apparatus for performing the process. The process and apparatus for performing it utilizes at least one photocell in combination with various electrical and optical elements for measuring the concentration of developing medium in the developing chamber, comparing the measured value to a nominal value, and controlling the replenishing of the developing medium correspondingly.
    Type: Grant
    Filed: December 18, 1974
    Date of Patent: May 10, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Schroter, Kurt Albrecht Wehlmann