Patents by Inventor Paul Y. Hsieh

Paul Y. Hsieh 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).

  • Thermographic printing method
    Patent number: 4103043
    Abstract: A method of printing on thermographic paper according to which the heat for causing the imaging color change in the thermographic coating is generated by means of current in a portion of the coating dampened by a thin film of a conductive salt solution which is dispensed on the thermographic coating. The current is generated by a printing head having spaced electrodes in contact with the dampened portion of the coating. The conductive salt solution may be deposited on the thermographic coating in liquid film form, combined with a thermographic material to form a conductive coating for printing in the dry state, or mixed with the thermographic material in liquid form and dispensed on plain paper in a thin film in the path of the writing head.
    Type: Grant
    Filed: September 22, 1976
    Date of Patent: July 25, 1978
    Assignee: Ing. C. Olivetti & C., S.p.A.
    Inventors: Paul Y. Hsieh, Eugene W. Rogall
  • Thermographic printing method
    Patent number: 4017366
    Abstract: A method of printing on thermographic paper according to which the heat for causing the imaging color change in the thermographic coating is generated by means of current in a portion of the coating dampened by a thin film of a conductive salt solution which is dispensed on the thermographic coating. The current is generated by a printing head having spaced electrodes in contact with the dampened portion of the coating. The conductive salt solution may be deposited on the thermographic coating in liquid film form, combined with a thermographic material to form a conductive coating for printing in the dry state, or mixed with the thermographic material in liquid form and dispensed on plain paper in a thin film in the path of the writing head.
    Type: Grant
    Filed: February 6, 1976
    Date of Patent: April 12, 1977
    Assignee: Ing. C. Olivetti & C., S.p.A.
    Inventors: Paul Y. Hsieh, Eugene W. Rogall
  • Liquid crystal mixtures for electro-optical display devices
    Patent number: 4000084
    Abstract: This invention is directed to liquid crystal mixtures which have an extended operating range and require a low operating voltage. They are white in color and stable to atmospheric oxygen, moisture, and light. Because of their superior properties, they are useful in electro-optical displays, especially in liquid crystal watches and pocket-size calculators.
    Type: Grant
    Filed: December 17, 1973
    Date of Patent: December 28, 1976
    Assignee: Hughes Aircraft Company
    Inventors: Paul Y. Hsieh, Yat-Shir Lee, John E. Jensen
  • Liquid crystal electro-optical display
    Patent number: 3981558
    Abstract: An electro-optical display, utilizing the field effect display, includes a thin layer of liquid crystal material positioned between two plates having electrically conductive segments. The material is a mixture of a selected stilbene, such as trans-4-n-butyl-alpha-chloro-4'-ethoxystilbene and a selected substituted benzylideneaminobenzonitrile, such as p-ethoxy-benzylidene-p'-aminobenzonitrile.
    Type: Grant
    Filed: November 12, 1973
    Date of Patent: September 21, 1976
    Assignee: Timex Corporation
    Inventors: Chan Soo Oh, Paul Y. Hsieh