Patents by Inventor John C. Haidos

John C. Haidos 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: 5597675
    Abstract: A phthalocyanine pigment dispersion using a dispersing polymer having pendant quaternary ammonium salt groups to form a highly dispersed and stable millbase is described. The pigment dispersion is compatible with poly(vinylbutyral) resins and stable in ketone solvents. The pigment dispersion is particularly useful as a charge-generating or charge-transport material in an organic photoconductor construction.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: January 28, 1997
    Assignee: Imation Corp.
    Inventors: Ravindra L. Arudi, John C. Haidos
  • Patent number: 5578548
    Abstract: A thermographic element containing: (a) a substrate; (b) an image-forming layer coated onto the substrate; and (c) overlaying the image-forming layer, a topcoat layer composed of the reaction product of (1) a polymer composed of interpolymerized units derived from: (i) about 45-65 wt % of vinyl-substituted aromatic monomer; (ii) about 15-30 wt % vinyl monomer containing a pendant nitrile group; (iii) about 5-30 wt % hydroxyl-containing; ethylenically-unsaturated monomer; and (2) a suitable crosslinking agent. A slip agent is optionally used. The topcoat layer provides a thermographic element with high gloss in the imaged areas; has excellent runnability with no chatter in the feed direction of the element; and exhibits no removal of topcoat which prevents formation of printhead-created voids in the imaged areas.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: November 26, 1996
    Assignee: Minnesota Mining & Manufacturing Company
    Inventors: Jon A. Bjork, Ramesh C. Kumar, John C. Haidos
  • Patent number: 5536611
    Abstract: A phthalocyanine pigment dispersion using a dispersing polymer having pendant quaternary ammonium salt groups to form a highly dispersed and stable millbase is described. The pigment dispersion is compatible with poly(vinylbutyral) resins and stable in ketone solvents. The pigment dispersion is particularly useful as a charge-generating or charge-transport material in an organic photoconductor construction.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: July 16, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Ravindra L. Arudi, John C. Haidos
  • Patent number: 5523115
    Abstract: The present invention provides magnetic recording media comprising a magnetizable layer and optionally a backside coating provided on a nonmagnetizable substrate. At least one of the magnetizable layer and the optional backside coating comprises a polymeric binder, wherein the polymeric binder is obtained from reactants comprising a free radical generator and a radiation curable polymer. The radiation curable polymer comprises a plurality of radiation curable, .alpha.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: June 4, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John C. Haidos, Ravindra L. Arudi, Nelson T. Rotto
  • Patent number: 5510187
    Abstract: Magnetic recording medium, comprising a magnetic layer provided on a nonmagnetizable substrate, wherein the magnetic layer comprises a magnetic pigment dispersed in a polymeric binder. The polymeric binder comprises a nonhalogenated vinyl copolymer, wherein the vinyl copolymer comprises a plurality of pendant nitrile groups, a plurality of pendant hydroxyl groups, and at least one pendant dispersing group. Preferably, the binder also includes a secondary polymer component.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: April 23, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Ramesh C. Kumar, Ravindra L. Arudi, James G. Carlson, Daniel Y. Chang, John C. Haidos, Keith J. Modert, Suman K. Patel, Nelson T. Rotto
  • Patent number: 5380905
    Abstract: The present invention provides magnetic recording media comprising a magnetizable layer and optionally a backside coating provided on a nonmagnetizable substrate. At least one of the magnetizable layer and the optional backside coating comprises a polymeric binder, wherein the polymeric binder is obtained from reactants comprising a free radical generator and a radiation curable polymer. The radiation curable polymer comprises a plurality of radiation curable, .alpha.
    Type: Grant
    Filed: October 9, 1991
    Date of Patent: January 10, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John C. Haidos, Ravindra L. Arudi, Nelson T. Rotto