Patents by Inventor Guofu F. Zhou

Guofu F. Zhou 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).

  • Reversible optical information medium
    Patent number: 5876822
    Abstract: A description is given of an reversible optical information medium comprising a substrate (1), a first dielectric layer (2), a phase-change recording layer on the basis of Ge-Sb-Te (3), a second dielectric layer (4), and a metal mirror layer (5). The recording layer (3) comprises an alloy having the composition Ge.sub.50x Sb.sub.40-40x Te.sub.60-10x, in atom %, wherein0.166.ltoreq.x.ltoreq.0.444and wherein the layer thickness d.sub.3 of said recording layer (3) ranges between 25 and 35 nm. Such a medium is suitable for high speed recording (i.e. at least twice the CD-speed), and has a large cyclability of at least 10.sup.5 direct overwrite cycles.
    Type: Grant
    Filed: February 6, 1997
    Date of Patent: March 2, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Guofu F. Zhou, James H. Coombs, Johan P. W. B. Duchateau
  • Method and device for recording a mark having a substantially constant number of pulses per unit length independent of writing speed on an optical information carrier
    Patent number: 5802032
    Abstract: A method is described for recording an optical information carrier, in which marks representing recorded data are written at different writing speeds by radiation pulse of equal length and power, independent of the writing speed. The number of pulses per unit length of the written mark is a constant independent of the writing speed.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: September 1, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Bernardus A.J. Jacobs, James H. Coombs, Johannes H.M. Spruit, Johan P.W.B. Duchateau, Guofu F. Zhou