Patents by Inventor Dennis A. Abramsohn

Dennis A. Abramsohn 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: 4988597
    Abstract: An electrophotographic imaging member including a supporting substrate, an electrically conductive layer including at least a partially crosslinked polymer having a backbone derived from an alkyl acrylamidoglycolate alkyl ether, a charge blocking layer including a polymer having a backbone also derived from an alkyl acrylamidoglycolate alkyl ether and at least one photoconductive layer. Preferably, the backbone derived from an alkyl acrylamidoglycolate alkyl ether is a copolymer of methyl acrylamidoglycolate methyl ether and a vinyl hydroxy ester or vinyl hydroxy amide. This imaging member may be prepared by a coating process and employed in an electrostatographic imaging process.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: January 29, 1991
    Assignee: Xerox Corporation
    Inventors: John W. Spiewak, Huoy-Jen Yuh, Constance J. Thornton, Dennis A. Abramsohn, Deborah Nichol-Landry, Joseph Mammino
  • Patent number: 4750018
    Abstract: A copier/printer having a transfer station for transferring images from an imaging member to copy sheets includes the improvement of removing debris from the surfaces of copy sheets facing the imaging member before the copy sheets reach the transfer station. At least a pair of cooperating rolls are positioned to form a nip for driving the copy sheets therebetween toward the transfer station. The cooperating rolls include a drive roll and a dielectric roll with the dielectric roll being electrostatically charged by the drive roll and paper through contact and separation during the intercopy gaps between copy sheets in transit to the transfer station through contact with the copy sheets to electrostatically attract debris from the copy sheets.
    Type: Grant
    Filed: June 26, 1987
    Date of Patent: June 7, 1988
    Assignee: Xerox Corporation
    Inventors: Arthur M. Gooray, Dennis A. Abramsohn, Stephen M. Borostyan, Joseph Mammino
  • Patent number: 4747992
    Abstract: A process is disclosed for forming at least one thin substantially uniform fluid coating comprising polymeric film forming material on a cylindrical mandrel, solidifying the fluid coating to form a uniform solid coating and separating the uniform solid coating from the mandrel. The process may comprise forming at least one thin substantially uniform fluid coating comprising polymeric film forming material around a cylindrical mandrel, the mandrel having a larger mass or lower thermal conductivity than the polymeric film forming material and a critical surface tension greater than the surface tension of the fluid coating, solidifying the fluid coating to form at least one thin substantially uniform solid coating comprising the polymeric film forming material around the cylindrical mandrel, heating both the uniform solid coating and the mandrel to a temperature at least above the apparent T.sub.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: May 31, 1988
    Inventors: Donald S. Sypula, Merlin E. Scharfe, Dennis A. Abramsohn, Paul J. Brach, Clifford H. Griffiths, Deborah J. Nichol-Landry, Andrew R. Melnyk, John W. Spiewak, Joseph Mammino, Edward C. Williams, Lieng-Huang Lee, Christine J. Tarnawskyj
  • Patent number: 4515882
    Abstract: An electrophotographic imaging system utilizing a member comprising at least one photoconductive layer and an overcoating layer comprising a film forming continuous phase comprising charge transport molecules and finely divided charge injection enabling particles dispersed in the continuous phase, the insulating overcoating layer being substantially transparent to activating radiation to which the photoconductive layer is sensitive and substantially electrically insulating at low electrical fields.
    Type: Grant
    Filed: January 3, 1984
    Date of Patent: May 7, 1985
    Assignee: Xerox Corporation
    Inventors: Joseph Mammino, Donald S. Sypula, Dennis A. Abramsohn, Martin A. Abkowitz, Merlin E. Scharfe