Patents Assigned to D. Drukker & Zn. N.V.
  • Microsurgical suture needles
    Patent number: 4699142
    Abstract: Microsurgical suture needles are made by providing a precious stone plate with main surfaces extending obliquely with respect to the longitudinal axis. A metal shank is provided with an end face extending correspondingly obliquely with respect to its longitudinal axis. The precious stone plate is attached with one main surface on the oblique end face of the metal shank. The other main surface of the precious stone plate is ground and provided with a sharp tip and cutting edges.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: October 13, 1987
    Assignee: D. Drukker & Zn. N.V.
    Inventors: Michael Seal, Franciscus M. Berkhout
  • Travelling wave tube and helix for such travelling wave tube
    Patent number: 4683400
    Abstract: A travelling wave tube comprising a tube and a helix mounted in the tube, the helix being made of diamond and being coated at least partially with an electrically conductive material.
    Type: Grant
    Filed: October 25, 1985
    Date of Patent: July 28, 1987
    Assignee: D. Drukker & Zn. N.V.
    Inventor: Michael Seal
  • Diamond Tool
    Patent number: 4619563
    Abstract: A diamond tool comprises a diamond (4) with a cutting edge (5) which diamond is encased in a sinter mass (7) which is brazed to the front end of a tool shank (1). The diamond (4) is brazed to a metal connection block (6) which is encased in the sinter mass (7) together with the diamond.
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: October 28, 1986
    Assignee: D. Drukker & Zn. N.V.
    Inventor: Jan Doting