Patents by Inventor Werner Hafner

Werner Hafner 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).

  • Method of forming a circuit board
    Patent number: 4402135
    Abstract: A circuit board is fabricated by injection molding a support of an insulating material. The support is provided with channels in the pattern of conductive paths. The channels are filled by injection with electrically conductive plastic, and electrically conductive metal is precipitated galvanoplastically on the plastic.
    Type: Grant
    Filed: April 3, 1981
    Date of Patent: September 6, 1983
    Assignee: Braun Aktiengesellschaft
    Inventors: Otto Schweingruber, Werner Hafner
  • Self-locking sealing and wiper ring
    Patent number: 4371177
    Abstract: A ring which provides efficient sealing against pressure differentials. The ring is an elastomer, cylindrical body with a bore, an inside face having inner and outer sealing lips, an outside face having an inner wiping lip and an outer support arm, and an annular support projection joining the outside wall of the body.
    Type: Grant
    Filed: October 8, 1981
    Date of Patent: February 1, 1983
    Assignee: Firma Carl Freudenberg
    Inventors: Gunter Bahr, Erich Habel, Werner Hafner
  • Piston
    Patent number: 4205595
    Abstract: A piston for use in pneumatic cylinders includes a tubular support with flange-like parts, a reinforcement ring received in the support and having a groove on its outside circumference, a guide ring rigidly mounted in the groove, and angular packing washers pre-vulcanized onto the reinforcement rings on both sides of the guide ring.
    Type: Grant
    Filed: January 27, 1978
    Date of Patent: June 3, 1980
    Assignee: Firma Carl Freudenberg
    Inventors: Werner Hafner, Erich Habel