Patents by Inventor John P. N. Haxell

John P. N. Haxell 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).

  • Stabilized pigmented hot melt ink containing nitrogen-modified acrylate polymer as dispersion-stabilizer agent
    Patent number: 5221335
    Abstract: In the embodiments described in the specification, a stabilized, pigmented hot melt ink contains a thermoplastic vehicle, a coloring pigment, and a dispersion-stabilizing agent to inhibit settling or agglomeration of the pigment when the ink is molten comprising 1.5 to 20 weight percent of a nitrogen-modified acrylate polymer. A preferred dispersion-stabilizing agent is the nitrogen-modified methacrylate polymer marketed by Rohm and Haas as Plexol 1525.
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: June 22, 1993
    Assignee: Coates Electrographics Limited
    Inventors: Kevin G. Williams, John P. N. Haxell, Derek E. Wilson
  • Transparent hot melt jet ink
    Patent number: 5185035
    Abstract: The transparent hot melt jet inks described in the specification include a coloring agent, a vehicle for the coloring agent including a thermoplastic nontransparent base material and a transparentizing agent containing a glycol ester of a C.sub.18-35 fatty acid, a glyceryl ester of a C.sub.18-36 fatty acid with metal soaps, a polyethylene wax having a molecular weight of 400 to 1200, a synthetic paraffin wax, or a linear alcohol with a molecular weight of 500 to 1000 or a mixture thereof, a microcrystalline or modified microcrystalline wax.
    Type: Grant
    Filed: July 29, 1991
    Date of Patent: February 9, 1993
    Assignee: Coates Electrographics Limited
    Inventors: Edward A. Brown, John P. N. Haxell, Michael A. Cockett
  • Low corrosion hot melt ink
    Patent number: 5066332
    Abstract: In the particular embodiments described in the specification, low-corrosion hot melt ink contains 0.5% to 10% by weight of a metallo-organic compound such as overbased calcium sulphonate, basic barium sulphonate and overbased sulphurized calcium alkyl phenate as a corrosion inhibitor. Such inks produce no significant corrosion of printing system components after extended exposure at elevated temperatures.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: November 19, 1991
    Assignee: Coates Electrographics Limited
    Inventors: Edward A. Brown, John P. N. Haxell, Derek E. Wilson
  • Dispersed pigmented hot melt ink
    Patent number: 5053079
    Abstract: In the embodiments described in the specification, a dispersed, pigmented hot melt ink contains a thermoplastic vehicle, a colored pigment, and a dispersing agent to inhibit settling or agglomeration of pigment when the ink is molten comprising an isocyanate-modified microcrystalline wax or lignite wax in an amount of 2 to 100 weight percent of the weight of the vehicle. Preferred is the isocyanate-modified microcrystalline wax marketed as Petrolite WB17.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: October 1, 1991
    Assignee: Coates Electrographics Limited
    Inventors: John P. N. Haxell, Edward A. Brown, Derek E. Wilson