Patents by Inventor Stephen J. Abbott

Stephen J. Abbott 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: 6819445
    Abstract: A printing system, available to a population of users on a network, checks whether files in recently-received print jobs are identical to files which have been previously decomposed or rasterized within a particular time frame prior to the submission of the job. If it is detected that a file to be printed in a recently-submitted job is identical to a file which has already been rasterized with the rasterized image available in memory, the system substitutes the already-rasterized file for the file submitted with the job, thus saving the time and resources for rasterizing the file in the recently-submitted job.
    Type: Grant
    Filed: January 25, 2000
    Date of Patent: November 16, 2004
    Assignee: Xerox Corporation
    Inventors: Duncan I. Stevenson, Alison M. Howse, Stephen J. Abbott
  • Patent number: 5778296
    Abstract: A xerographic cassette for a printing or copying machine includes a photoreceptor drum, a cleaning blade, and a waste toner conveyor for conveying waste toner cleaned off the photoreceptor drum by the cleaning blade into the interior of the photoreceptor drum for storage. The conveyor includes a flexible helical wire which acts as an auger. A curved tube portion of the conveyor passes through an auxiliary waste toner container. Once the auxiliary container is substantially full, waste toner is conveyed into the interior of the photoreceptor drum. The auxiliary container is provided with an aperture which enables it to be emptied, thereby prolonging the useful life of the cassette.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: July 7, 1998
    Assignee: Xerox Corporation
    Inventors: Jan J. van der Steen, Ruud Vullers, Marcel Kuipers, Jozef P. M. Logtens, Roderick A. Cooley, Derek J. Milton, Andrew E. Taylor, Stephen J. Abbott
  • Patent number: 5137798
    Abstract: A pit-forming optical recording medium comprises a substrate supporting a film of optically deformable recording material comprising an organic dye for absorbing optical signals of modulated electromagnetic radiation applied to the film and thereby causing corresponding deformations of the film when the signal intensities exceed predetermined threshold levels. The dye is a phthalocyanine compound or mixture of phtalocyanine compounds in which each of at least five of the peripheral carbon atoms in the 1, 4, 5, 8,9, 12, 13 or 16 positions (the "3,6-positions") of the phthalocyanine nucleus, as shown in Formula I, is linked by an atom from Group VB or Group VIB of the Periodic Table to a carbon atom of an organic radical. In preferred compounds each of the eight 3,6-positions is linked by an atom from Group VB or Group VIB, especially sulphur, selenium or nitrogen, to an organic radical.
    Type: Grant
    Filed: July 5, 1990
    Date of Patent: August 11, 1992
    Assignees: Imperial Chemical Industries PLC, TDK Corporation
    Inventors: Peter J. Duggan, Paul F. Gordon, Stephen J. Abbott, Akihiko Kuroiwa, Toshiki Aoi, Tezumbumi Kamijo