Patents by Inventor Robert A. Duffy

Robert A. Duffy 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).

  • Patent number: 5911043
    Abstract: A system for rating information retrieved from a computer network includes a server and a client. The server includes a rate module that generates a rate file for documents retrieved from the network. A client includes a screen module that accesses the rate file to prevent access to certain documents by the user of the client.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: June 8, 1999
    Assignee: Baker & Botts, L.L.P.
    Inventors: Robert A. Duffy, Lyle N. Griffin
  • Patent number: 5708931
    Abstract: The enclosed an electrostatographic printing apparatus including: (a) an imaging member capable of retaining a latent image, wherein the imaging member includes an imaging layer on a substrate comprised of a magnetic material with a magnetic permeability of at least 1.001; (b) charging apparatus for charging the surface of the imaging member, thereby resulting in a charged surface; (c) exposure apparatus for exposing a portion of the charged surface to radiation, thereby substantially discharging the exposed portion, wherein the substantially discharged, exposed portion corresponds to the image area of the latent image; and (d) a single component development apparatus for depositing toner particles on the substantially discharged, exposed portion of the imaging member.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: January 13, 1998
    Assignee: Xerox Corporation
    Inventors: Geoffrey M. T. Foley, William G. Herbert, Mark C. Petropoulos, Richard H. Nealey, Robert A. Duffy
  • Patent number: 5358296
    Abstract: An apparatus is disclosed for internally holding an at least partially hollow substrate having at least one open end. The apparatus includes a member defining a fluid passageway, a normally inflated porous material mounted on the member in communication with the fluid passageway of the member, and a mechanism, in communication with the member, for deflating the porous material, the deflating mechanism being de-energized in response to the porous material being disposed into the opening in the substrate for enabling the porous material to return to being normally inflated to hold the substrate.
    Type: Grant
    Filed: May 14, 1993
    Date of Patent: October 25, 1994
    Assignee: Xerox Corporation
    Inventors: David J. Kilmer, Geoffrey M. Foley, Alexander A. Antonelli, Eugene A. Swain, Mark C. Petropoulos, Robert A. Duffy, John K. Williams