Patents by Inventor Yuan S. Tyan

Yuan S. Tyan 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).

  • Optical recording media
    Patent number: 5271978
    Abstract: Optical recording films made from alloys of antimony-tin and a third element exhibit improved properties when formed in an atmosphere containing oxygen. The amount of oxygen in the sputtering environment is controlled. Improvements include higher amorphous to crystalline transition temperature, improved carrier to noise ratio (CNR) and greater stability of the recorded film.
    Type: Grant
    Filed: January 31, 1992
    Date of Patent: December 21, 1993
    Assignee: Eastman Kodak Company
    Inventors: Fridrich Vazan, Yuan S. Tyan, Kee C. Pan
  • Erasable optical recording materials and methods based on tellurium alloys
    Patent number: 5196294
    Abstract: An optical recording element comprising a thin film of an alloy is disclosed. The alloy is represented by the formulaTe.sub.a (Sb.sub.x Sn.sub.y In.sub.z).sub.1-awherein a is between about 0.38 and 0.62; x is between about 0.05 and 0.65; y divided by z is between about 0.5 and 5; with the proviso that the product of (y+z) and (1-a) is greater than about 0.20. The alloys have improved data stability while retaining excellent write-erase characteristics.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: March 23, 1993
    Assignee: Eastman Kodak Company
    Inventors: Kee C. Pan, Yuan S. Tyan, Fridrich Vazan
  • Master for optical element replication
    Patent number: 5051340
    Abstract: A master for the replication of optical elements is prepared by the steps of:(a) focusing an information modulated energy beam on a phase-change optical recording layer so as to form a pattern of two different phases in said layer corresponding to said information; and(b) selectively etching away one of said two different phases so as to form a relief pattern corresponding to said information.The master so made can be used directly as the stamper in the injection molding process or the 2-P process for the replication of optical elements.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: September 24, 1991
    Assignee: Eastman Kodak Company
    Inventors: Yuan S. Tyan, Kee C. Pan, George R. Olin, Thomas Mayer
  • Erasable optical recording method
    Patent number: 4797871
    Abstract: The method comprises the steps of:a. providing an optical recording element comprising an amorphous thin film of a GeTe alloy;b. preparing the thin film for writing and erasing cycles by crystallizing the film;c. writing on selected portions of the prepared film with modulated laser beam, thereby converting portions on the films to a phase-segregated amorphous state.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: January 10, 1989
    Assignee: Eastman Kodak Company
    Inventors: Yuan S. Tyan, Kee C. Pan, Fridrich Vazan