Patents by Inventor Lawrence K. F. Cheung

Lawrence K. F. Cheung 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).

  • Flat panel x-ray imager with gain layer
    Patent number: 6437339
    Abstract: A flat panel x-ray imager includes a gain layer (charge multiplication layer) that facilitates imaging at low x-ray exposure levels. The gain layer can be a gas chamber or a solid state material operating in an avalanche mode.
    Type: Grant
    Filed: March 22, 2001
    Date of Patent: August 20, 2002
    Assignee: Hologic, Inc.
    Inventors: Denny L. Y. Lee, Lawrence K. F. Cheung, Andrew P. Smith
  • Flat panel x-ray imager with gain layer
    Publication number: 20010032934
    Abstract: A flat panel x-ray imager includes a gain layer (charge multiplication layer) that facilitates imaging at low x-ray exposure levels. The gain layer can be a gas chamber or a solid state material operating in an avalanche mode.
    Type: Application
    Filed: March 22, 2001
    Publication date: October 25, 2001
    Applicant: Hologic, Inc.
    Inventors: Denny L.Y. Lee, Lawrence K.F. Cheung, Andrew P. Smith
  • Photohardenable electrostatic master having improved backtransfer and charge decay
    Patent number: 4818660
    Abstract: Photohardenable electrostatic master comprising an electrically conductive substrate, e.g., aluminized polyethylene terephthalate, bearing a layer of a photopolymer comprising an organic polymeric binder, compound having at least one ethylenically unsaturated group, photoinitiator, an aromatic amino compound, as defined, and an acid, e.g., p-toluene sulfonic acid, or an oxidized substituted aromatic amino compound. The photohardenable electrostatic master having improved charge decay and backtransfer is used for electrostatic proofing, etc.
    Type: Grant
    Filed: November 4, 1987
    Date of Patent: April 4, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Graciela B. Blanchet-Fincher, Curtis R. Fincher, Jr., Lawrence K.-F. Cheung, Rolf Dessauer, Catharine E. Looney