Patents by Inventor Dat Q. Nguyen

Dat Q. Nguyen 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).

  • Selective removal of photoreceptor coatings by ultrasonification
    Patent number: 6881272
    Abstract: A method for recycling photoconductors is disclosed. In this method, the charge transport layer is selectively removed from the photoconductor without adversely affecting the electrical properties of the charge generating layer. The recycled drum may then be recoated with a new charge transport layer and reused in an electrophotographic process. In this method, the photoconductor to be recycled is placed in a specifically selected solvent, such as a dibasic ester, and is subjected to ultrasonic energy, preferably for a period not to exceed about 15 minutes.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: April 19, 2005
    Assignee: Lexmark International, Inc.
    Inventors: David G. Black, Weimei Luo Gheleta, Ronald H. Levin, Dat Q. Nguyen
  • Selective removal of photoreceptor coatings by ultrasonification
    Publication number: 20030230321
    Abstract: A method for recycling photoconductors is disclosed. In this method, the charge transport layer is selectively removed from the photoconductor without adversely affecting the electrical properties of the charge generating layer. The recycled drum may then be recoated with a new charge transport layer and reused in an electrophotographic process. In this method, the photoconductor to be recycled is placed in a specifically selected solvent, such as a dibasic ester, and is subjected to ultrasonic energy, preferably for a period not to exceed about 15 minutes.
    Type: Application
    Filed: June 6, 2002
    Publication date: December 18, 2003
    Inventors: David G. Black, Weimei Luo Gheleta, Ronald H. Levin, Dat Q. Nguyen