Patents by Inventor Adriaan Jacob Groothoff

Adriaan Jacob Groothoff 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).

  • Deflection unit for color television display tubes
    Patent number: 3991392
    Abstract: Before mounting, coils heads comprising clearly defined faces and edges are formed on deflection coils by moulding. The sides of the flared portion of the coils are also clearly defined by the same operation. After mounting, the coil bears in the coil holder by way of the faces and edges formed.The sides of the flared portion abut against projections formed on the coil holder. The flared portion is completely clear from the coil holder.
    Type: Grant
    Filed: June 13, 1975
    Date of Patent: November 9, 1976
    Assignee: U.S. Philips Corporation
    Inventor: Adriaan Jacob Groothoff
  • Picture display device and deflection coil both having self-aligning surfaces
    Patent number: 3934169
    Abstract: In a picture display tubes having deflection angles of 110.degree. and more the conical central part near the transition to the neck has a substantially flat variation perpendicular to the tube axis. As a result of this an accurate positioning of the deflection device on the display tube is seriously hampered. This problem is solved by centering members which are present on the conical central part and which cooperate in a self-centering manner with centering members forming part of the supporting cage of the deflection device. The position of the deflection device in the axial direction is accurately fixed by abutment members forming part of the supporting cage in co-operation with abutment surfaces forming part of the envelope of the tube.
    Type: Grant
    Filed: November 9, 1973
    Date of Patent: January 20, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Adriaan Jacob Groothoff, Martin Clemens VAN DER Heijde, Johannes Aloysius Van Leeuwen, Constantius Johannes Waltherus Panis