Patents by Inventor Willem Johannes Postma

Willem Johannes Postma 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 making an adjusting pin for a ferro-magnetic core
    Patent number: 4023263
    Abstract: A method of making an adjusting pin fit into a cylindrical bore in a ferro-magnetic core having a sharp edge includes the step of axially inserting the pin into the bore from the side having the sharp edge whereby the sharp edge cuts off a part of the pin projecting outside of the circumference of the cylindrical bore.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: May 17, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Willem Johannes Postma
  • Coil shape comprising an H-shaped coil core
    Patent number: 3947796
    Abstract: A coil shape comprising:A. an H-shaped ferromagnetic coreB. a coil former of synthetic material.The coil former is moulded about the H-shaped core and is provided with grooves such that the mechanical stresses produced by the shrinking of the coil former are completely or substantially removed.
    Type: Grant
    Filed: April 4, 1975
    Date of Patent: March 30, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Willem Johannes Postma, Hans Tielrooy, Johannes Hubertus Tobben
  • Adjusting pin for a ferro-magnetic core
    Patent number: 3944958
    Abstract: An adjusting pin for a ferromagnetic core comprising a cylindrical opening. The adjusting pin has a rigid head with longitudinal ridges which thicken in the direction of the end and which are cut off when the adjusting pin is inserted into the cylindrical opening, with the result that the head fits exactly in the opening.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: March 16, 1976
    Assignee: U.S. Philips Corporation
    Inventor: Willem Johannes Postma