Patents by Inventor Erwin Bollian

Erwin Bollian 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 for the production of tri-metallic contact rivets
    Patent number: 4744502
    Abstract: There is described an improved process for the production of tri-metallic contact rivets, in the course of which a cylindrical slug is formed with increased diameter under constant plastic deformation (upsetting) from three wire segments, and on this slug a head is then formed on one end by transformation.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: May 17, 1988
    Assignee: Dr. Eugen Durrwachter Doduco Kg.
    Inventor: Erwin Bollian
  • Process for the production of bi-metallic contact rivets
    Patent number: 4446618
    Abstract: A process for the production of bi-metallic contact rivets with especially thin precious metal layers.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: May 8, 1984
    Assignee: Dr. Eugen Durrwachter Doduco KG
    Inventor: Erwin Bollian
  • Method of and apparatus for manufacturing double contact rivets
    Patent number: 4073425
    Abstract: A double-contact rivet is formed from wire portions cut from wire supplies. The wire portions are aligned so that outer portions of electric contact material are located on either side of a central portion of support material, and the two outer portions are cold-welded to the central portion. One end of the body so formed is punched to provide a contact head while the bead formed by the cold-welding at the other end is pressed to a substantially flat ring form and hardened by rapid cooling. The hardened ring bead is cleanly cut from the remainder of the rivet.
    Type: Grant
    Filed: December 2, 1976
    Date of Patent: February 14, 1978
    Assignee: Eugen Durrwachter Doduco
    Inventor: Erwin Bollian