Patents Assigned to Kern & Co.
  • Apparatus for correcting theodolites
    Patent number: 4136955
    Abstract: The corrected values to compensate for errors in instrumental levelling of a theodolite and similar instruments are found by determining angles of elevation and/or horizontal directions, measuring the instrumental levelling errors, and calculating the error free values of the instrument.
    Type: Grant
    Filed: August 27, 1976
    Date of Patent: January 30, 1979
    Assignee: Kern & Co. AG
    Inventors: Heinz Aeschlimann, Rene Nunlist, Rudolf Stocker
  • Method for the manufacture of writing instruments
    Patent number: 4003665
    Abstract: A stylus is assembled from a plastic tip having an axial bore and an ink tube in said bore centered therein and welded thereto. Ultrasonic welding is used for softening and partially melting the tip. On switching off the ultrasonic energy source, the molten portion of the tip hardens and provides a strong bond between the tip and the ink tube.
    Type: Grant
    Filed: March 20, 1975
    Date of Patent: January 18, 1977
    Assignee: Kern & Co. AG
    Inventors: Hans Dreyer, Roman Etter