Patents by Inventor Dennis J. O'Keefe

Dennis J. O'Keefe 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).

  • Cross-linked polyester toners and process of making such toners
    Patent number: 6359105
    Abstract: Cross-linked toner resin having linear portions and cross-linked portions of high density microgel particles, where the toner resin is an unsaturated polyester resin, is prepared using a liquid chemical initiator such as 1,1-bis(t-butyl peroxy)-3,3,5-trimethylcyclohexane so that the cross-linked resin achieved contains less than 0.20 percent by weight of acids. In particular, the cross-linked toner resin is free of benzoic acid. The method of making the cross-linked toner resin includes (a) spraying the liquid chemical initiator onto the unsaturated polyester resin prior to, during or subsequent to melting of the unsaturated polyester resin to form a polymer melt; and (b) subsequently cross-linking the polymer melt under high shear to form the cross-linked toner resin.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: March 19, 2002
    Assignee: Xerox Corporation
    Inventors: John James Ianni, J. Stephen Kittelberger, Daniel Andrew Harrington, Eugene Frederick Young, Hui Chang, Nilmarie Santos-Roman, Dennis J. O'Keefe, Joseph Louis Leonardo, Paul Lynn Jacobs, Kiran B. Sheth, Dongming Li, Louis Joseph Kurtic, Jr., Robert Edward Lutz, Yelena Lipovetskaya
  • Magnetic toner compositions with surface additives
    Patent number: 5489497
    Abstract: A toner comprised of resin, magnetite treated, or coated with a phosphate titanium component, optional wax, charge additive, and surface additives comprised of silica and metal oxides.
    Type: Grant
    Filed: September 1, 1994
    Date of Patent: February 6, 1996
    Assignee: Xerox Corporation
    Inventors: Eugene F. Young, Dennis J. O'Keefe
  • Magnetic compositions with surface additives
    Patent number: 5487841
    Abstract: A toner comprised of resin, magnetite treated, or coated with a phosphate titanium component, optional wax, charge additive, and surface additives comprised of silica and metal oxides.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: January 30, 1996
    Assignee: Xerox Corporation
    Inventors: Eugene F. Young, Dennis J. O'Keefe
  • Clip for clamping adjoining flat-bladed helical coils
    Patent number: 5165146
    Abstract: A U-shaped clip having leg parts disposed outwardly from a crown on either side of a central axis, the leg parts having a configuration for intermeshing with each other during a clinching operation. The crown, on the interior thereof, is provided with a locking rib which extends transversely of the crown, the locking rib providing a planar surface which maintains abutting or adjoining metal tapes in a rigid position to prevent longitudinal and transverse movements between the metal tapes.
    Type: Grant
    Filed: August 23, 1991
    Date of Patent: November 24, 1992
    Assignee: Stanley/Hartco the Stanley Works
    Inventor: Dennis J. O'Keefe