Robert J Gruber

US Patent:

45630860, Jan 7, 1986

Filed:

Oct 22, 1984

Appl. No.:

6/663610

Inventors:

John F. Knapp - Fairport NY
Robert J. Gruber - Pittsford NY
Steven B. Bolte - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500

US Classification:

355 14D

Abstract:

An electrophotographic printing machine in which a magnetic toner image is transferred to a copy sheet from a photoconductive member and fused thereto. The toner image fused to the copy sheet is magnetized and the intensity of the magnetic field generated by the toner image detected to provide a continuous indication of the quality of the toner image fused to the copy sheet.

US Patent:

46955240, Sep 22, 1987

Filed:

May 21, 1986

Appl. No.:

6/865327

Inventors:

John F. Knapp - Fairport NY
Robert J. Gruber - Pittsford NY
Lawrence Floyd - Rochester NY
Steven B. Bolte - Rochester NY
Michael G. Swales - Sodus NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1300
G03G 910

US Classification:

430 32

Abstract:

Disclosed is a process for generating consistent high quality images comprised of (1) providing a xerographic imaging or printing apparatus; (2) adding thereto a stable two component developer composition comprised of toner composition with an average particle diameter of from about 6 to about 10 microns with resin particles, first pigment particles, second magnetite pigment particles, which are present in a greater amount than the first pigment particles, and blended flow additive particles; and carrier particles consisting of a ferrite core, or a steel core, and a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxysilane; and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images or magnetic images in the apparatus; and (4) developing the images formed.

US Patent:

45200920, May 28, 1985

Filed:

Dec 27, 1983

Appl. No.:

6/566754

Inventors:

John F. Knapp - Fairport NY
Robert J. Gruber - Pittsford NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1309

US Classification:

430120

Abstract:

A process for obtaining smudge resistant images and for preventing the deposition of unwanted toner particles in an imaging apparatus which comprises (a) providing a xerographic imaging apparatus, (b) adding an improved two component contamination free developer composition to said apparatus, which composition consists essentially of from about 50 percent to about 80 percent by weight of a resin comprised of the polymeric esterification product of a dicarboxylic acid and a diol comprising a diphenol of the following formula ##STR1## wherein R is selected from substituted and unsubstituted alkylene radicals having from about 2 to about 12 carbon atoms, alkylidene radicals having from 1 to 12 carbon atoms and cycloalkylidene radicals having from 3 to 12 carbon atoms; R' and R" are selected from substituted and unsubstituted alkylene radicals having from 2 to 12 carbon atoms, alkylene arylene radicals having from 8 to 12 carbon atoms and arylene radicals; X and X'; are selected from hydrogen or any alkyl radical having from 1 to 4 carbon atoms; and each n is a number of from 0 (zero) to 4, about 20 percent to about 50 percent by weight of magnetite and a carrier material consisting of a steel core coated with a polymethyl methacrylate resin or a polyvinylidene fluoride resin, (c) forming electrostatic latent images in the imaging apparatus, and (d) developing the images formed.

US Patent:

48761699, Oct 24, 1989

Filed:

Oct 24, 1988

Appl. No.:

7/261661

Inventors:

Robert J. Gruber - Pittsford NY
Raymond A. Yourd - Cleveland Heights OH
Shadi L. Malhotra - Mississauga, CA
Robert A. Nelson - Webster NY
Carol A. Fox - Fairport NY
Thomas R. Hoffend - Webster NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 908

US Classification:

430110

Abstract:

A toner composition comprised of particles of a polyester with siloxane block segments therein, which particles have incorporated therein release additives.

US Patent:

44542143, Jun 12, 1984

Filed:

Dec 3, 1982

Appl. No.:

6/446739

Inventors:

Robert J. Gruber - Pittsford NY
Paul C. Julien - Webster NY
Raymond A. Yourd - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 908

US Classification:

430110

Abstract:

This invention relates to improved positively charged toner compositions for use in developing electrostatic images contained in electrostatographic imaging devices wherein fusing is accomplished with a fuser roll fabricated from lead oxide and a vinylidene fluoride hexafluoropropylene copolymer, which composition is comprised of resin particles, pigment particles, and as the charge enhancing additive present in an amount of from about 0. 1 percent by weight to about 10 percent by weight, a pyridinium tetrafluoroborate of the following formula: ##STR1## wherein R. sub. 1 is an alkyl group containing from about 1 carbon atom to about 22 carbon atoms, and R. sub. 2 is an alkyl group containing from about 1 carbon atom to about 8 carbon atoms, or a halogen, and n is zero or 1.

US Patent:

43189741, Mar 9, 1982

Filed:

Oct 6, 1980

Appl. No.:

6/194484

Inventors:

Thomas J. Pacansky - San Jose CA
Robert J. Gruber - Pittsford NY
John F. Knapp - Fairport NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 910

US Classification:

430108

Abstract:

Disclosed is an improved toner composition comprised of a colorant and a copolycarbonate resin, which toner has an intrinsic viscosity of from about 0. 10 to about 0. 6 dl/gr. (deciliters per gram) a melt flow temperature (T. sub. f) of from about 70. degree. C. to about 125. degree. C. , a flash fusing energy of from about 3 J/in. sup. 2 to about 8 J/in. sup. 2, (Joules per inch squared), and a glass transition temperature of from about 50. degree. C. to about 65. degree. C.

US Patent:

40122522, Mar 15, 1977

Filed:

Sep 30, 1975

Appl. No.:

5/618299

Inventors:

Robert J. Gruber - Pittsford NY
Nicholas J. Germano - Fairport NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1704

US Classification:

96 1PE

Abstract:

3-Bromo-N-2"-pyridyl-8,13-dioxodinaphtho-(2,1-b;2',3'-d)-furan-6-carboxamid e is described as a new composition of matter along with its use in electrophotographic and photoelectrophoretic imaging processes.

US Patent:

44644523, Aug 7, 1984

Filed:

May 2, 1983

Appl. No.:

6/490264

Inventors:

Robert J. Gruber - Pittsford NY
Paul C. Julien - Webster NY
Raymond A. Yourd - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 908
G03G 910

US Classification:

430110

Abstract:

Developer composition with a negative charge enhancing additive is disclosed.