Patents by Inventor Thomas A. Jadwin
Thomas A. Jadwin 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).
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Patent number: 7033720Abstract: 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.Type: GrantFiled: June 2, 2004Date of Patent: April 25, 2006Assignee: Eastman Kodak CompanyInventors: Thomas A. Jadwin, John F. Crichton, Robert D. Fields, Eric C. Stelter
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Publication number: 20050271961Abstract: A paper having toner fixed on its surface, with the toner including a near infrared absorbing dye. The toner-paper absorbance difference is about 0.2 or less at 450 nm, 550 nm, and 650 nm, and about 0.1 or greater at 935 nm.Type: ApplicationFiled: March 4, 2005Publication date: December 8, 2005Inventors: Thomas Jadwin, Raymond Hardaway, Thomas Foster
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Patent number: 6861192Abstract: A binder polymer composition for electrostatographic toners comprises a carboxysubstituted precursor polymer crosslinked by reaction with an N,N,N?N?-tetrakis(2-hydroxyalkyl) bisamide compound of the structure wherein R1 is a substituted or unsubstituted alkylene group containing 1 to about 10 carbon atoms and R2 is H or an alkyl group containing 1 to about 6 carbon atoms.Type: GrantFiled: July 2, 2002Date of Patent: March 1, 2005Assignee: Eastman Kodak CompanyInventors: John C. Wilson, Thomas A. Jadwin, Paul L. Nielsen
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Publication number: 20040219447Abstract: 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.Type: ApplicationFiled: June 2, 2004Publication date: November 4, 2004Inventors: Thomas A. Jadwin, John F. Crichton, Robert D. Fields, Eric C. Stelter
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Patent number: 6797448Abstract: 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.Type: GrantFiled: May 3, 2002Date of Patent: September 28, 2004Assignee: Eastman Kodak CompanyInventors: Robert D. Fields, Thomas J. Foster, Paul L. Nielsen, Thomas A. Jadwin, Dinesh Tyagi
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Patent number: 6766136Abstract: 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.Type: GrantFiled: March 31, 2003Date of Patent: July 20, 2004Assignee: Eastman Kodak CompanyInventors: Thomas A. Jadwin, John F. Crichton, Robert D. Fields, Eric C. Stelter
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Publication number: 20030190541Abstract: 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.Type: ApplicationFiled: March 31, 2003Publication date: October 9, 2003Inventors: Thomas A. Jadwin, John F. Crichton, Robert D. Fields, Eric C. Stelter
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Patent number: 6610451Abstract: 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.Type: GrantFiled: December 26, 2000Date of Patent: August 26, 2003Assignee: Heidelberger Druckmaschinen AGInventors: Thomas A. Jadwin, John F. Crichton, Robert D. Fields, Eric C. Stelter
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Patent number: 6589703Abstract: 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.Type: GrantFiled: May 11, 2001Date of Patent: July 8, 2003Assignee: Heidelberger Druckmaschinen AGInventors: Eric C. Stelter, Robert D. Fields, Thomas A. Jadwin
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Publication number: 20030069368Abstract: A binder polymer composition for electrostatographic toners comprises a carboxysubstituted precursor polymer crosslinked by reaction with an N,N,N′N′-tetrakis(2-hydroxyalkyl) bisamide compound of the structure 1Type: ApplicationFiled: July 2, 2002Publication date: April 10, 2003Inventors: John C. Wilson, Thomas A. Jadwin, Paul L. Nielsen
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Publication number: 20030013032Abstract: 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.Type: ApplicationFiled: May 3, 2002Publication date: January 16, 2003Inventors: Robert D. Fields, Thomas J. Foster, Paul L. Nielsen, Thomas A. Jadwin, Dinesh Tyagi
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Publication number: 20020115006Abstract: 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.Type: ApplicationFiled: December 26, 2000Publication date: August 22, 2002Inventors: Thomas A. Jadwin, John F. Crichton, Robert D. Fields, Eric C. Stelter
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Publication number: 20010055723Abstract: 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.Type: ApplicationFiled: May 11, 2001Publication date: December 27, 2001Inventors: Eric C. Stelter, Robert D. Fields, Thomas A. Jadwin
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Patent number: 5783346Abstract: There is provided a toner composition which comprises a binder and a colorant, wherein said binder comprisesa copolymer of a vinyl aromatic monomer; a second monomer selected from the group consisting of conjugated diene monomers or acrylate monomers selected from the group consisting of alkyl acrylate monomers and alkyl methacrylate monomers; a third monomer which is a crosslinking agent; a fourth monomer which is an adhesion promoting vinyl monomer containing a hydroxyl group; and a fifth monomer which is a charge control vinyl monomer containing an amine group. In a preferred embodiment, the binder further comprises the acid form of an amino acid soap which is the salt of an alkyl sarcosine having an alkyl group which contains from about 10 to about 20 carbon atoms. In additional preferred embodiments, the toner compositions of the invention further include a charge control agent. In other preferred embodiments, the toner compositions of the invention are used with a carrier.Type: GrantFiled: January 6, 1997Date of Patent: July 21, 1998Assignees: Eastman Kodak Company, Goodyear Tire & Rubber CompanyInventors: Thomas A. Jadwin, Dinesh Tyagi, Gary Lee Burroway
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Patent number: 5489975Abstract: An electrostatic image on an image member already containing a loose dry first toner image is toned with a second toner, for example, a toner of a second and different color from the first toner image. The toning is accomplished by a developer having a high coercivity permanently magnetized carrier and toner which is moved through a development zone by a rapidly rotating core inside a sleeve on which the developer moves. Pole transitions caused by the rapidly moving core make the high coercivity permanently magnetized carrier move vigorously in a wave motion having alternating crests and troughs. Scavenging of the first toner image is prevented by separating the sleeve from the image member sufficiently that the crests of the developer do not touch the image member during the toning process. An alternating electrical field is applied between the sleeve and the image member to enhance development.Type: GrantFiled: March 13, 1995Date of Patent: February 6, 1996Assignee: Eastman Kodak CompanyInventors: Joseph Y. Kaukeinen, Thomas A. Jadwin, Peter S. Alexandrovich, Eric C. Stelter
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Patent number: 5480757Abstract: A two component electrophotographic developer and development method. The developer includes carrier particles and toner comprising: polymeric binder; a first agent selected from the group consisting of compounds having the general structure: ##STR1## wherein n is from about 7 to about 21; R.sup.1 and R.sup.2 are each independently H or alkyl having from 1 to about 3 carbons; T represents an unshared electron pair or a proton and a counterion; and R.sup.3 is substituted or unsubstituted alkyl, alkylamide, aryl, or heteroaryl; and a second agent comprising quaternary ammonium salt.Type: GrantFiled: June 8, 1994Date of Patent: January 2, 1996Assignee: Eastman Kodak CompanyInventors: Thomas A. Jadwin, Hans W. Osterhoudt, John M. Spence, Dinesh Tyagi
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Patent number: 5409791Abstract: An electrostatic image on an image member already containing a loose dry first toner image is toned with a second toner, for example, a toner of a second and different color from the first toner image. The toning is accomplished by a developer having a high coercivity permanently magnetized carrier and toner which is moved through a development zone by a rapidly rotating core inside a sleeve on which the developer moves. Pole transitions caused by the rapidly moving core make the high coercivity permanently magnetized carrier move vigorously in a wave motion having alternating crests and troughs. Scavenging of the first toner image is prevented by separating the sleeve from the image member sufficiently that the crests of the developer do not touch the image member during the toning process. An alternating electrical field is applied between the sleeve and the image member to enhance development.Type: GrantFiled: May 20, 1993Date of Patent: April 25, 1995Assignee: Eastman Kodak CompanyInventors: Joseph Y. Kaukeinen, Thomas A. Jadwin, Peter S. Alexandrovich, Eric C. Stelter
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Patent number: 5364725Abstract: New electrostatic toners and developers are provided containing new colorless charge-control agents comprising acyloxy-t-alkylated benzoic acids.Type: GrantFiled: March 15, 1993Date of Patent: November 15, 1994Assignee: Eastman Kodak CompanyInventors: John C. Wilson, Steven M. Bonser, Thomas A. Jadwin
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Patent number: 5255057Abstract: An electrostatic latent image on a photoconductor of an electrophotographic device is developed by a gray scale monocomponent nonmagnetic development system using a combination of AC and DC bias voltages applied to a developer roller and a monocomponent nonmagnetic developer applied to the developer roller by an adder roller. The developer comprises a mixture of toner particles charged to one polarity and transparent beads charged to the opposite polarity, by triboelectric charging in bulk in an alternating field between the two rollers, rather than by friction contact with apparatus surfaces. The adder roller applies the charged mixture to the developer roller for developing the latent image in an electric field to an image density determined by the magnitude of the DC bias. A DC bias may be applied to the adder roller, especially to provide a gradient relative to the DC component of the developer roller bias for driving the bulk charged mixture onto the developer roller.Type: GrantFiled: May 29, 1992Date of Patent: October 19, 1993Assignee: Eastman Kodak CompanyInventors: Eric C. Stelter, Joseph E. Guth, William Vreeland, Thomas A. Jadwin
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Patent number: 5061586Abstract: Disclosed are two-phase glass composite carrier particles which comprise a composite of a magnetically hard ferrite material having a single phase hexagonal crystalline structure of the formula MO.6Fe.sub.2 O.sub.3 where M is barium, strontium or lead exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/gm when in an applied field of 1000 Oersteds which is dispersed in a glass matrix comprised of from about 10 to 20 molar percent CuO, from about 10 to 40 molar percent BaO and from about 10 to 40 molar percent B.sub.2 O.sub.3 ; or a glass matrix comprised of from about 10 to 20 molar percent of V.sub.2 O.sub.5, from about 10 to 40 molar percent BaO and from about 10 to 40 molar percent B.sub.2 O.sub.3.Also disclosed is an electrostatic two-phase dry developer composition comprising charged toner particles mixed with oppositely charged carrier particles as described above.Type: GrantFiled: April 5, 1990Date of Patent: October 29, 1991Assignee: Eastman Kodak CompanyInventors: Bijay S. Saha, Thomas A. Jadwin