Patents by Inventor Roel Ritsma

Roel Ritsma 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).

  • Switch with contacts which can be seen through a window
    Patent number: 6373355
    Abstract: Switch with at least one set of interacting contacts which is accommodated in the switch housing and can be seen through a transparent window. The contacts are arranged on the free ends of current-carrying strips which run towards the window. At least one of the strips has U-shaped section adjacent to its contact, the opening of the U-shaped section facing away from the window. A plate made from magnetizable material is arranged between the limbs of the U-shaped section of at least one strip.
    Type: Grant
    Filed: November 29, 2000
    Date of Patent: April 16, 2002
    Assignee: Holec Holland N.V.
    Inventors: Albert Jozef Peter Postmus, Aloysius Gerardus Majella Hemmer, Roel Ritsma