Robert A Fields

US Patent:

6589703, Jul 8, 2003

Filed:

May 11, 2001

Appl. No.:

09/853412

Inventors:

Eric C. Stelter - Pittsford NY
Robert D. Fields - Rochester NY
Thomas A. Jadwin - Rochester NY

Assignee:

Heidelberger Druckmaschinen AG - Heidelberg

International Classification:

G03G 908

US Classification:

430122, 4301113, 43011131

Abstract:

Disclosed are methods and apparatus for electrographic development which utilize a rotating magnetic core, a toner shell disposed around the rotating magnetic core, and developer compositions disposed on the toner shell which include a hard magnetic material, such as a strontium ferrite. The shell in embodiments has an outer surface with a surface roughness Ra of less than 32 microinches. The methods and apparatus do not require special manufacturing steps to place surface roughness or irregularities on the shell, and, thus, can provide the same or better image quality with relatively less complex manufacturing steps and at reduced cost.

US Patent:

6610451, Aug 26, 2003

Filed:

Dec 26, 2000

Appl. No.:

09/747764

Inventors:

Thomas A. Jadwin - Rochester NY
John F. Crichton - Honeoye Falls NY
Robert D. Fields - Rochester NY
Eric C. Stelter - Pittsford NY

Assignee:

Heidelberger Druckmaschinen AG - Heidelberg

International Classification:

G03G 9083

US Classification:

4301061, 4301086, 4301087

Abstract:

Development systems and methods for developing using magnetic toner are disclosed. The present invention further discloses developers used in development systems as well as the toner used in developer for magnetic ink character recognition printing. With respect to the development system, a development system is disclosed which includes a supply of dry developer mixture which contains magnetic toner particles and hard magnetic carrier particles. The development system further includes a non-magnetic, cylindrical shell for transporting the developer between the supply and the development zone, wherein the shell can be rotatable or stationary. A rotating magnetic core of a pre-selected magnetic field strength and means for rotating at least the magnetic core to provide for the transport of the toner particles from the shell to an electrostatic image also provided as part of the development system. A method for developing electrostatic image with magnetic toner is further disclosed, for example, involving the above-described development system. Magnetic toner particles having a low magnetic loading such as on the order of 28% by weight or less, based on the weight of the toner are further described wherein these magnetic toners can include a spacing agent on the surface of the magnetic toner particles.

US Patent:

6692880, Feb 17, 2004

Filed:

May 6, 2002

Appl. No.:

10/139782

Inventors:

Robert D. Fields - Rochester NY
Dinesh Tyagi - Fairport NY
John C. Wilson - Rochester NY
Peter Alexandrovich - Rochester NY
Robert Guistina - Rochester NY

Assignee:

Heidelberger Druckmaschinen AG - Heidelberg

International Classification:

G03G 9097

US Classification:

4301081, 4301083, 4301084, 4301085, 43011141, 430122

Abstract:

Toner formulations and developers containing the toner formulations are described. The toner contains at least one toner resin, at least one first charge control agent capable of providing a consistent level of charge, at least one second charge control agent capable of providing a sustained level of charge, at least one surface treatment agent, and at least one release agent and optionally at least one colorant. The toners of the present invention preferably provide a consistent level of charge of from about -10 to about -30 micro C/gm and also provide this level of charge for a sustained period of time, such as from about 2 to about 10 minutes. The toners of the present invention also provides excellent ruboff values for an image printed from the toners of the present invention. Methods of improving ruboff are described as well as methods to develop an image using the toner of the present invention.

US Patent:

6766136, Jul 20, 2004

Filed:

Mar 31, 2003

Appl. No.:

10/403539

Inventors:

Thomas A. Jadwin - Rochester NY
John F. Crichton - Honeoye Falls NY
Robert D. Fields - Rochester NY
Eric C. Stelter - Pittsford NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G 9083

US Classification:

399267, 4301061, 4301086, 4301087

Abstract:

Development systems and methods for developing using magnetic toner are disclosed. The present invention further discloses developers used in development systems as well as the toner used in developer for magnetic ink character recognition printing. With respect to the development system, a development system is disclosed which includes a supply of dry developer mixture which contains magnetic toner particles and hard magnetic carrier particles. The development system further includes a non-magnetic, cylindrical shell for transporting the developer between the supply and the development zone, wherein the shell can be rotatable or stationary. A rotating magnetic core of a pre-selected magnetic field strength and means for rotating at least the magnetic core to provide for the transport of the toner particles from the shell to an electrostatic image also provided as part of the development system. A method for developing electrostatic image with magnetic toner is further disclosed, for example, involving the above-described development system. Magnetic toner particles having a low magnetic loading such as on the order of 28% by weight or less, based on the weight of the toner are further described wherein these magnetic toners can include a spacing agent on the surface of the magnetic toner particles.

US Patent:

6797448, Sep 28, 2004

Filed:

May 3, 2002

Appl. No.:

10/138840

Inventors:

Robert D. Fields - Rochester NY
Thomas J. Foster - Genesco NY
Paul L. Nielsen - Lima NY
Thomas A. Jadwin - Rochester NY
Dinesh Tyagi - Fairport NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03O 1509

US Classification:

430122, 4301061, 399267

Abstract:

Development systems and methods for developing using toner are disclosed. The present invention further discloses developers used in development systems. With respect to the development system, a development system is disclosed which includes a supply of dry developer mixture which contains toner particles and hard magnetic carrier particles. The development system further includes a non-magnetic, cylindrical shell for transporting the developer between the supply and the development zone, wherein the shell can be rotatable or stationary. A rotating magnetic core of a pre-selected magnetic field strength and means for rotating at least the magnetic core to provide for the transport of the toner particles from the shell to an electrostatic image also provided as part of the development system. The development system of the present invention further includes a fuser roll which is coated with a silicone rubber or other low surface energy elastomer or resin. The fuser roll is preferably in a pressure contact arrangement with a backup or pressure roll.

US Patent:

7033720, Apr 25, 2006

Filed:

Jun 2, 2004

Appl. No.:

10/858960

Inventors:

Thomas A. Jadwin - Rochester NY, US
John F. Crichton - Honeoye Falls NY, US
Robert D. Fields - Rochester NY, US
Eric C. Stelter - Pittsford NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G 9/083

US Classification:

430122, 4301061, 43011131, 4301086

Abstract:

Development systems and methods for developing using magnetic toner are disclosed. The present invention further discloses developers used in development systems as well as the toner used in developer for magnetic ink character recognition printing. With respect to the development system, a development system is disclosed which includes a supply of dry developer mixture which contains magnetic toner particles and hard magnetic carrier particles. The development system further includes a non-magnetic, cylindrical shell for transporting the developer between the supply and the development zone, wherein the shell can be rotatable or stationary. A rotating magnetic core of a pre-selected magnetic field strength and means for rotating at least the magnetic core to provide for the transport of the toner particles from the shell to an electrostatic image also provided as part of the development system. A method for developing electrostatic image with magnetic toner is further disclosed, for example, involving the above-described development system. Magnetic toner particles having a low magnetic loading such as on the order of 28% by weight or less, based on the weight of the toner are further described wherein these magnetic toners can include a spacing agent on the surface of the magnetic toner particles.

US Patent:

7056637, Jun 6, 2006

Filed:

Jun 12, 2003

Appl. No.:

10/460514

Inventors:

Robert D. Fields - Rochester NY, US
Dinesh Tyagi - Fairport NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G 5/00

US Classification:

4301088, 4301101, 4301114, 43013721, 399222

Abstract:

Toner particles are described containing at least one toner resin and at least one wax. The wax present in the toner particles has an average domain size of about 1 micron or less. Developer systems, two component and monocomponent, are further described as well development systems and methods for developing an electrostatic image.

US Patent:

7087355, Aug 8, 2006

Filed:

Mar 18, 2005

Appl. No.:

11/083726

Inventors:

Robert D. Fields - Rochester NY, US
Dinesh Tyagi - Fairport NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G 9/08

US Classification:

4301088, 4301093, 430122

Abstract:

Toner particles having at least one toner resin and at least one polyalkylene wax or a wax having a percent crystallinity of 80% or more are described. The wax that is present in the toner particles has a polydispersity of 2. 0 or higher or a percent crystallinity of 80% or more, and also preferably has a number average molecular weight of about 2,000 or higher and/or a melting temperature onset of from about 115 C. to about 130 C. Development systems using the toner particles of the present invention are further described. Also, improvements in various properties associated with development systems are further described such as reduced toner dust levels as well as improved toner image abrasion resistance.