Patents by Inventor Gerrit W. Tichelaar

Gerrit W. Tichelaar 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).

  • Patent number: 4321454
    Abstract: Plasma-MIG welding in which a thermally ionizable gas stream is flowed through a nozzle non-consumable electrode having a central orifice and a surrounding annular opening toward a workpiece and is thereby split into a central gas column enveloped by an annular gas shield. A consumable electrode is fed through the central gas column toward the workpiece, with the establishment of a MIG-arc therebetween. A plasma arc is then spontaneously established by means of the MIG-arc between the nozzle non-consumable electrode and the workpiece. The central plasma gas column is accelerated by constriction of the annular gas shield downstream of the nozzle non-consumable electrode.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: March 23, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus A. M. Willems, Gerrit W. Tichelaar
  • Patent number: 4234778
    Abstract: Plasma-MIG welding in which a thermally ionizable gas stream is flowed through a nozzle non-consumable electrode having a central orifice and a surrounding annular opening toward a workpiece and is thereby split into a central gas column enveloped by an annular gas shield. A consumable electrode is fed through the central gas column toward the workpiece, with the establishment of a MIG-arc therebetween. A plasma arc is then spontaneously established by means of the MIG-arc between the nozzle non-consumable electrode and the workpiece. The central plasma gas column is accelerated by constriction of the annular gas shield downstream of the nozzle non-consumable electrode.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: November 18, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus A. M. Willems, Gerrit W. Tichelaar
  • Patent number: 4174477
    Abstract: A method of plasma MIG welding in which an arc is maintained between a workpiece and a welding wire in a thermally ionized gas (auxiliary plasma) which is generated by an electric gas-discharge between two non-consumable electrodes; neither the welding wire nor the workpiece acts as a single electrode for generating the thermally ionized gas.
    Type: Grant
    Filed: May 24, 1977
    Date of Patent: November 13, 1979
    Assignee: U.S. Philips Corporation
    Inventors: Wilhelmus G. Essers, Gerardus Jelmorini, Gerrit W. Tichelaar
  • Patent number: 4146773
    Abstract: A compact plasma-MIG welding torch in which the non-consumable electrode and the contact tube for the consumable electrode are accommodated in separate passages in the housing whereby the distance between the non-consumable electrode and the contact tube becomes comparatively small, the distance between the contact tube and the nozzle is short, and the extension of the consumable electrode is small during welding.
    Type: Grant
    Filed: March 17, 1977
    Date of Patent: March 27, 1979
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus A. M. Willems, Gerrit W. Tichelaar
  • Patent number: 4142090
    Abstract: Plasma MIG welding in which a plasma flow is generated between a non-consumable electrode and a workpiece, and a consumable electrode is fed through such plasma flow toward the workpiece to establish a MIG arc between the same. The current intensity in the plasma flow is increased by applying additional current thereto from an annular auxiliary non-consumable electrode surrounding the plasma flow and positioned between the primary non-consumable electrode and the workpiece.
    Type: Grant
    Filed: July 1, 1977
    Date of Patent: February 27, 1979
    Assignee: U.S. Philips Corporation
    Inventors: Wilhelmus G. Essers, Gerardus Jelmorini, Gerrit W. Tichelaar