Patents by Inventor Leonardus P. J. Hoogeveen

Leonardus P. J. Hoogeveen 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).

  • Optically readable storage disc
    Patent number: 4622661
    Abstract: An interchangeable optically readable storage disk has a substrate with a recording surface, and a cover thereon which may comprise a second substrate with a further recording layer. The disk includes a protecting arrangement at the circumference of the substrate, which includes a balancing arrangement. The balancing may be effected by apertures in the protecting arrangement, or balancing masses affixed thereto.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: November 11, 1986
    Assignee: Optical Storage International Holland
    Inventors: Leonardus P. J. Hoogeveen, Hendrikus W. C. M. Peeters, Aloysius M. J. M. Spruijt
  • Device for determining gaseous components
    Patent number: 4130758
    Abstract: Device for determining the concentration of vaporous components in a gas current, wherein the gas current reacts in a heated reaction room with ozon and the intensity of the chemiluminescent radiation emitted herewith is measured by a photoelectric cell.
    Type: Grant
    Filed: April 20, 1977
    Date of Patent: December 19, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Sybrandus van Heusden, Leonardus P. J. Hoogeveen