Patents by Inventor Gaye K. Lehman

Gaye K. Lehman 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).

  • Patent number: 6194106
    Abstract: This invention discloses novel surface release layers on temporary image receptors particularly suited to the requirements of liquid electrographic (both electrophotographic and electrostatic) printing on a variety of receptors. The inventive temporary image receptors are comprised of a surface release layer on a photoreceptive or dielectric substrate. The release layers are silicone copolymers which are chemically modified to improve imaging, drying or transfer performance when used in the simplified color electrophotography (SCE) or electrostatic printing processes.
    Type: Grant
    Filed: May 23, 2000
    Date of Patent: February 27, 2001
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Kathryn R. Bretscher, Terri L. Butler, Mark C. Berens, James A. Baker, Gay L. Herman, Larry D. Boardman, Gaye K. Lehman
  • Patent number: 6106989
    Abstract: This invention discloses novel surface release layers on temporary image receptors particularly suited to the requirements of liquid electrographic (both electrophotographic and electrostatic) printing on a variety of receptors. The inventive temporary image receptors are comprised of a surface release layer on a photoreceptive or dielectric substrate. The release layers are silicone copolymers which are chemically modified to improve imaging, drying or transfer performance when used in the simplified color electrophotography (SCE) or electrostatic printing processes.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: August 22, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Kathryn R. Bretscher, Terri L. Butler, Mark C. Berens, James A. Baker, Gay L. Herman, Larry D. Boardman, Gaye K. Lehman
  • Patent number: 6020098
    Abstract: This invention discloses novel surface release layers on temporary image receptors particularly suited to the requirements of liquid electrographic (both electrophotographic and electrostatic) printing on a variety of receptors. The inventive temporary image receptors are comprised of a surface release layer on a photoreceptive or dielectric substrate. The release layers are silicone copolymers which are chemically modified to improve imaging, drying or transfer performance when used in the simplified color electrophotography (SCE) or electrostatic printing processes.
    Type: Grant
    Filed: April 4, 1997
    Date of Patent: February 1, 2000
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Kathryn R. Bretscher, Terri L. Butler, Mark C. Berens, James A. Baker, Gay L. Herman, Larry D. Boardman, Gaye K. Lehman
  • Patent number: 5965243
    Abstract: The invention is textured surface release layers for dielectric substrates used in liquid electrostatic imaging processes. The invention also includes means of providing textured release surfaces for dielectric substrates, and a method of liquid electrostatic imaging using textured dielectric substrates.
    Type: Grant
    Filed: April 4, 1997
    Date of Patent: October 12, 1999
    Assignee: 3M Innovative Properties Company
    Inventors: Terri L. Butler, Kathryn R. Bretscher, Mark C. Berens, James A. Baker, Gaye K. Lehman
  • Patent number: 5932321
    Abstract: The invention provides electrographic imaging sheets comprising a substrate carrying a layer of dielectric material which has abhesive properties suitable for the release of a multicolored toner image from the dielectric surface during image transfer, while also having good toning properties during the several development stages of a multicolor toner imaging process.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: August 3, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John F. Eisele, Valdis Mikelsons, Gaye K. Lehman, Paul J. Wang, Patricia J. A. Brandt
  • Patent number: 5928726
    Abstract: A method of modulating coating patterns is disclosed. The method uses the steps of dispensing a composite comprising a carrier fluid layer and a transferring the composite to the substrate, wherein interfacial interaction among the carrier fluid layer, the functional fluid layer, and the substrate generates a patterned coating of the functional layer on the substrate. The coating patterns provide controlled release surfaces for tapes, image receptors, and the like.
    Type: Grant
    Filed: April 3, 1997
    Date of Patent: July 27, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Terri L. Butler, Kathryn R. Bretscher, Mark C. Berens, James A. Baker, Gaye K. Lehman
  • Patent number: 5733698
    Abstract: The invention is photoconductor construction comprising a release layer which controls the carrier liquid on the surface of the photoreceptor and minimizes beading of toner carrier liquid. According to one embodiment this invention is a photoconductor construction comprising a photoconductor layer applied to an electroconductive substrate, an interlayer applied to the photoconductor layer, and a release layer over the interlayer. The release layer is a swellable polymer. According to another embodiment this invention is a photoconductor construction comprising a polymeric release layer that has a surface with an average roughness, Ra, of at least 10 nm.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: March 31, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gaye K. Lehman, Claire A. Jalbert, Edward J. Woo, Kathryn R. Bretscher, James A. Baker, Mark C. Berens
  • Patent number: 5723242
    Abstract: This invention is a photoconductive element comprising an electroconductive substrate, a photoconductive layer on a surface of the electroconductive substrate, and a release layer over the photoconductive layer. The release layer comprises a fluoroether polymer which is the reaction product of components comprising: A) a di-functional perfluoroether, B) a diisocyanate, C) an amino functional silane, and D) optionally, a diol chain extender.
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: March 3, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Edward J. Woo, Gaye K. Lehman
  • Patent number: 5702803
    Abstract: The invention provides electrographic imaging sheets comprising a substrate carrying a layer of dielectric material which has abhesive properties suitable for the release of a multicolored toner image from the dielectric surface during image transfer, while also having good toning properties during the several development stages of a multicolor toner imaging process.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: December 30, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John F. Eisele, Valdis Mikelsons, Gaye K. Lehman, Paul J. Wang, Patricia J. A. Brandt
  • Patent number: 5652078
    Abstract: This invention is a photoconductive assembly comprising an electroconductive substrate, a photoconductive layer on a surface of the electroconductive substrate, and a release layer over the photoconductive layer wherein the release layer comprises a silicone polymer which has a bimodal distribution of chain lengths between cross-links.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: July 29, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Claire A. Jalbert, Gaye K. Lehman, James F. Sanders, David J. Schreifels, Edward J. Woo
  • Patent number: 5650253
    Abstract: Method and apparatus for producing an image on plain paper from image data using a photoreceptor. An image-wise distribution of charges is produced on the photoreceptor corresponding to the image data. A liquid ink having solid charged pigmented particles, the liquid ink having an effective glass transition temperature of less than 25 degrees Celsius is applied to the photoreceptor forming an image-wise distribution of the pigmented particles on the photoreceptor to form the image. The liquid ink has greater than seventy-five percent by volume fraction of solids in the image. A film forming means is positioned against the photoreceptor immediately following the application means to dry the image of the liquid ink to film forming within 0.5 seconds. The image is dried on the photoreceptor. The image is then transferred to an elastomeric transfer roller which forms a first transfer nip under pressure with the photoreceptor.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: July 22, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: James A. Baker, Truman F. Kellie, Edward J. Woo, Kent E. Emerson, Wu-Shyong Li, Gaye K. Lehman, Gay L. Herman, Brian P. Teschendorf, Claire A. Jalbert, Valdis Mikelsons
  • Patent number: 5262259
    Abstract: An electrographic imaging process is described in which electrostatic images are toned in sequence to form a multicolor intermediate image on a temporary dielectric receptor. The intermediate image is then transferred to a permanent receptor. Certain relative properties of the toner and the intermediate image, such as surface energy, T.sub.g, work of adhesion, and complex dynamic viscosity, have been found to be important to the production of good final images.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: November 16, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Hsin-hsin Chou, John F. Eisele, Gaye K. Lehman, Wu-Shyong Li, Valdis Mikelsons, Michael J. Petrich, Prabhakara S. Rao, Thomas J. Staiger, Paul J. Wang, Gregory L. Zwaldo, Michael G. Baier, Richard H. Olson
  • Patent number: 5106710
    Abstract: An electrographic imaging process is described in which electrostatic images are toned in sequence to form a multicolor intermediate image on a temporary dielectric receptor. The intermediate image is then transferred to a permanent receptor. Certain relative properties of the toner and the intermediate image, such as surface energy, T.sub.g, work of adhesion, and complex dynamic viscosity, have been found to be important to the production of good final images.
    Type: Grant
    Filed: March 1, 1990
    Date of Patent: April 21, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Paul J. Wang, Gaye K. Lehman