Robert F Gruber

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:

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.

US Patent:

44878257, Dec 11, 1984

Filed:

Jan 22, 1981

Appl. No.:

6/227003

Inventors:

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

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 914

US Classification:

4301066

Abstract:

This invention relates to a conductive single component magnetic dry toner comprised of resins selected from polystyrene allyl alcohol copolymers, and epoxy resins, a magnetic material such as magnetite, and a conductive carbon black which is adhered and/or embedded on the surface of the copolymer or epoxy resin-magnetic material mixture. Such toner compositions, which have excellent conductivity, superior flow properties and low melt fusing temperatures, 95. degree. C. -130. degree. C. , are useful for causing the development of images in commercial printers and recorders such as the Versatec printers.

US Patent:

39534626, Apr 27, 1976

Filed:

Oct 29, 1973

Appl. No.:

5/411596

Inventors:

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

Assignee:

Xeerox Corporation - Stamford CT

International Classification:

C07D40504

US Classification:

260295A

Abstract:

3-Bromo-N-2"-pyridyl-8,13-dioxodinaphtho-(2,1-b;3',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:

45783381, Mar 25, 1986

Filed:

Aug 31, 1984

Appl. No.:

6/645892

Inventors:

Robert J. Gruber - Pittsford NY
Ronald J. Koch - Webster NY
John F. Knapp - Fairport NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1314

US Classification:

430120

Abstract:

An improved process for the development and fixing of electrostatic latent images which comprises (1) generating an electrostatic latent image on a photoconductive imaging member, (2) developing this image with a toner composition comprised of toner resin particles, pigment particles, and a wax component of a molecular weight of from about 500 to about 20,000, (3) transferring the developed image to a suitable substrate, and subsequently (4) fusing the transferred image with a compliant oil fuser roll, wherein the amount of fuser oil consumed is from about one microliter to about three microliters per page of developed image.

US Patent:

43784208, Mar 29, 1983

Filed:

Sep 3, 1981

Appl. No.:

6/298983

Inventors:

Robert J. Gruber - Pittsford NY
Steven B. Bolte - Webster NY
Richard F. Koehler - Webster NY
Edward W. Connors - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1308
G03G 910
G03G 2100

US Classification:

430120

Abstract:

This invention is generally directed to an improved process for rapidly charging uncharged replenishment toner particles to a positive polarity, and the use of such particles for developing images in an electrostatographic imaging system, which process comprises (1) adding uncharged replenishment toner particles to a charged developer composition comprised of carrier particles and toner particles, the carrier particles consisting of a core containing a polymer coating thereon having incorporated therein an additive having a pKa of less than 5, said additive being selected from the group consisting of perfluorooctanoic acid, 2,4-dinitrophenol, 2,4,6-trinitrophenol, and naphthalene sulfonic acids, (2) contacting the charged developing composition containing said carrier particles with the uncharged toner particles, wherein positive charges are transferred to the uncharged toner particles within a mixing period of from about 5 seconds to about 5 minutes, thereby resulting in substantially the same level of positive charge intensity for said uncharged toner particles as the charge intensity of toner particles in the charged developer composition, said charge intensity ranging from about 0. 1 femtocoulombs per micron, to about 3 femtocoulombs per micron of toner particles.