Patents by Inventor Yi-Hua Tsa

Yi-Hua Tsa 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).

  • Detectable markers in cationic polymeric fixers
    Patent number: 6830310
    Abstract: A cationic polymeric fixer material including cationic polymers and at least one marker composition soluble in the fixer material and detectable under either ultraviolet or near IR light; as well as a method of inkjet printing using said fixer material and a method of detecting cationic polymeric fixer material on a printed media using said fixer material.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: December 14, 2004
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Kai Kong Iu, Yi-Hua Tsa