Patents by Inventor Gerrit H. Van Leeuwen

Gerrit H. Van Leeuwen 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).

  • Plasma display with discharge medium containing hydrogen or a hydrogen isotope
    Patent number: 6411030
    Abstract: A display device comprising channels (30, 30′, 30″) containing an ionizable gas (33), and walls of the channels (30, 30′, 30″) being provided with row electrodes (31, 32) for selectively ionizing the ionizable gas (33) during operation. The display device is further provided with an electro-optical layer (35) and means for activating said electro-optical layer (35). The display device is characterized in that the ionizable gas (33) contains a carrier gas and an additional gas, said additional gas comprising deuterium or deuterium hydrogen, or hydrogen and a further gas having a higher molecular weight. Preferably, helium or nitrogen is used as the carrier gas, and the additional gas comprises deuterium or deuterium hydrogen, or hydrogen and nitrogen, or hydrogen and xenon.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: June 25, 2002
    Assignee: Koninklijke Philips Electronics, N.V.
    Inventors: Gerrit H. Van Leeuwen, Udo Van Slooten
  • Reference current loop
    Patent number: 5341087
    Abstract: Reference current loop comprising a group of identical ICs (1, 2, 3), comprising each a first impedance (7) connected in series to the first impedance of another IC of the group. The combination of first impedances is connected to a reference current source (4). The voltage across the first impedance (7) is convened to a current (I0) by a voltage-to-current converter (8) and made available as a current (I1, I2) proportional to the reference current (Iref) of the reference current source (4) by a current mirror circuit (20, 23). The relation between the currents I1 and I2 and the reference current Iref is determined by the ratio of the impedance value of the first impedance (7) to that of the second impedance (19). This ratio is the same for all the ICs, so that the currents I1 and I2 in all the ICs are mutually equal.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: August 23, 1994
    Assignee: U.S. Philips Corporation
    Inventor: Gerrit H. Van Leeuwen
  • Arrangement for converting an electric signal into an acoustic signal or vice versa and a non-linear network for use in the arrangement
    Patent number: 4709391
    Abstract: An arrangement for converting an electric signal into an acoustic signal (y/t) or vice versa, comprises an electroacoustic transducer (2) and means (3) for reducing distortion in the output signal of the arrangement, which distortion is caused by the electroacoustic or acoustoelectric conversion performed by the transducer.The means comprise a non-linear network (3', 3" or 3'" in FIGS. 3; 43', 43" or 43'" in FIG. 4). The non-linear network is arranged for reducing non-linear distortion by compensating for at least a second or higher order distortion component in the output signal of the arrangement. The network may comprise at least two parallel circuit branches (15a, 15b in FIG. 3; 47a, 47b in FIG. 4). At least one of the circuit branches (15b in FIG. 3; 47b in FIG. 4) compensates for non-linear distortion of the second or higher order.
    Type: Grant
    Filed: May 30, 1985
    Date of Patent: November 24, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus J. M. Kaizer, Gerrit H. Van Leeuwen