Patents by Inventor Chikafumi Yokoyama

Chikafumi Yokoyama 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).

  • Publication number: 20110039040
    Abstract: A method of forming microstructures on a substrate is disclosed. A microstructured assembly that may be used in the method for forming microstructures on a substrate is also disclosed. The methods and assemblies of the present disclosure can reduce the amount of air entrapped in barrier ribs formed on substrates used in Plasma Display devices.
    Type: Application
    Filed: August 29, 2007
    Publication date: February 17, 2011
    Inventors: Chikafumi Yokoyama, Takaki Sugimoto
  • Publication number: 20090061116
    Abstract: A method of forming microstructures on a substrate is disclosed. A microstructured assembly that may be used in the method for forming microstructures on a substrate is also disclosed. The methods and assemblies of the present disclosure can reduce the amount of air entrapped in barrier ribs formed on substrates used in Plasma Display devices.
    Type: Application
    Filed: August 29, 2007
    Publication date: March 5, 2009
    Inventors: Chikafumi Yokoyama, Takaki Sugimoto
  • Publication number: 20080246190
    Abstract: To provide a flexible mold useful for manufacturing a PDP rib having a lattice pattern and other microstructures, and capable of highly precisely manufacturing the microstructures without involving defects such as occurrence of bubbles and pattern deformation. A flexible mold comprises a base layer made of a first curable material having a viscosity of 3,000 to 100,000 cps at 10 to 80° C. and a coating layer coating a surface of the base layer and made of a second curable material having a viscosity of 200 cps or below at 10 to 80° C.
    Type: Application
    Filed: May 8, 2008
    Publication date: October 9, 2008
    Inventors: Chikafumi Yokoyama, Akira Yoda, Hiroshi Kikuchi
  • Patent number: 7404919
    Abstract: To provide a flexible mold (10) useful for manufacturing a PDP rib having a lattice pattern and other microstructures, and capable of highly precisely manufacturing the microstructures without involving defects such as occurrence of bubbles and pattern deformation. A flexible mold (10) comprises a base layer (2) made of a first curable material having a viscosity of 3,000 to 100,000 cps at 10 to 80° C. and a coating layer (3) coating a surface of the base layer (2) and made of a second curable material having a viscosity of 200 cps or below at 10 to 80° C.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: July 29, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Chikafumi Yokoyama, Akira Yoda, Hiroshi Kikuchi
  • Patent number: 7288013
    Abstract: A method of forming microstructures on a substrate is disclosed. A microstructured assembly that may be used in the method for forming microstructures on a substrate is also disclosed. The methods and assemblies of the present disclosure can reduce the amount of air entrapped in barrier ribs formed on substrates used in Plasma Display devices.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: October 30, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Chikafumi Yokoyama, Takaki Sugimoto
  • Publication number: 20070071948
    Abstract: The invention relates to methods of making barrier partitions, flexible molds (e.g. suitable for making barrier partitions), methods of making flexible molds and (e.g. plasma) display panel articles.
    Type: Application
    Filed: September 28, 2005
    Publication date: March 29, 2007
    Inventors: Chikafumi Yokoyama, Hiroshi Kikuchi, Vincent King
  • Publication number: 20070063649
    Abstract: In a PDP back surface plate comprising substrate and a rib pattern layer formed on the substrate and having a rib region that has ribs having a predetermined shape and a predetermined size, and a non-rib region that occupies at least a part of a peripheral portion of the rib region, a thin film made of the same material as that of the ribs is formed to a predetermined thickness in the non-rib region.
    Type: Application
    Filed: December 15, 2003
    Publication date: March 22, 2007
    Inventors: Akira Yoda, Hiroshi Kikuchi, Chikafumi Yokoyama, Takaki Sugimoto
  • Publication number: 20060113713
    Abstract: A method of producing a substrate for a plasma display panel by providing a rib on a base, which comprises the steps of contacting a rib precursor containing a first photo-setting initiator having a first absorption edge and a first photo-setting component closely with said base; filling a mold, obtained by photo-setting of a second photo-setting initiator having a second absorption edge whose wavelength is shorter than a wavelength corresponding to said first absorption edge of said first photo-setting initiator, with said rib precursor; exposing said rib precursor to light having a wavelength longer than a wavelength corresponding to said second absorption edge, thereby setting said rib precursor; and removing said mold.
    Type: Application
    Filed: January 11, 2006
    Publication date: June 1, 2006
    Inventor: Chikafumi Yokoyama
  • Publication number: 20050253290
    Abstract: To provide a flexible mold (10) useful for manufacturing a PDP rib having a lattice pattern and other microstructures, and capable of highly precisely manufacturing the microstructures without involving defects such as occurrence of bubbles and pattern deformation. A flexible mold (10) comprises a base layer (2) made of a first curable material having a viscosity of 3,000 to 100,000 cps at 10 to 80° C. and a coating layer (3) coating a surface of the base layer (2) and made of a second curable material having a viscosity of 200 cps or below at 10 to 80° C.
    Type: Application
    Filed: June 10, 2003
    Publication date: November 17, 2005
    Applicant: 3M Innovative Properties Company
    Inventors: Chikafumi Yokoyama, Akira Yoda, Hiroshi Kikuchi
  • Publication number: 20050212182
    Abstract: To provide a flexible mold capable of easily and correctly manufacturing protuberances such as PDP ribs at predetermined positions with high dimensional accuracy. A flexible mold comprises a support made of a material having a tensile strength of at least 5 kg/mm2 and containing a moisture to saturation at a temperature and a relative humidity at the time of use by moisture absorption treatment applied in advance, and a molding layer having a groove pattern having a predetermined shape and a predetermined size on its surface.
    Type: Application
    Filed: June 20, 2003
    Publication date: September 29, 2005
    Inventors: Chikafumi Yokoyama, Takayuki Kawai
  • Publication number: 20050206034
    Abstract: To provide a transfer mold that is useful for producing a fine structure having a surface area and a complicated rib shape such as a grid-like rib, can be easily peeled from a master mold used as a matrix and can form a protrusion pattern, particularly a grid-like protrusion pattern, free from defects such as breakage, destruction and deformation while keeping high dimensional accuracy of the matrix.
    Type: Application
    Filed: January 6, 2005
    Publication date: September 22, 2005
    Inventors: Chikafumi Yokoyama, Akira Yoda, Hiroshi Kikuchi
  • Publication number: 20050093202
    Abstract: A method of forming microstructures on a substrate is disclosed. A microstructured assembly that may be used in the method for forming microstructures on a substrate is also disclosed. The methods and assemblies of the present disclosure can reduce the amount of air entrapped in barrier ribs formed on substrates used in Plasma Display devices.
    Type: Application
    Filed: October 31, 2003
    Publication date: May 5, 2005
    Inventors: Chikafumi Yokoyama, Takaki Sugimoto
  • Patent number: 6846773
    Abstract: A process for the production of a mono-olefin from a gaseous paraffinic hydrocarbon having at least two carbon atoms or mixtures thereof comprising reacting said hydrocarbons and molecular oxygen in the presence of a platinum catalyst. The catalyst consists essentially of platinum modified with Sn or Cu and supported on a ceramic monolith.
    Type: Grant
    Filed: March 20, 1997
    Date of Patent: January 25, 2005
    Assignee: Regents of the University of Minnesota
    Inventors: Chikafumi Yokoyama, Sameer S. Bharadwaj, Lanny D. Schmidt
  • Patent number: 6843952
    Abstract: A method of producing a substrate for a plasma display panel by providing a rib on a base, which comprises the steps of contacting a rib precursor containing a first photo-setting initiator having a first absorption edge and a first photo-setting component closely with said base; filling a mold, obtained by photo-setting of a second photo-setting initiator having a second absorption edge whose wavelength is shorter than a wavelength corresponding to said first absorption edge of said first photo-setting initiator, with said rib precursor; exposing said rib precursor to light having a wavelength longer than a wavelength corresponding to said second absorption edge, thereby setting said rib precursor; and removing said mold.
    Type: Grant
    Filed: February 16, 2000
    Date of Patent: January 18, 2005
    Assignee: 3M Innovative Properties Company
    Inventor: Chikafumi Yokoyama
  • Patent number: 6821178
    Abstract: A method of producing barrier ribs for a plasma display panel substrate, which comprises the steps of: (a) partially filling a groove portion of a mold with a first photosensitive glass-ceramic paste selected from a photosensitive black glass-ceramic paste and a photosensitive white glass-ceramic paste, and curing the paste by irradiating with radiation; (b) supplying a second photosensitive glass-ceramic paste, which is different from the first photosensitive glass-ceramic paste, selected from the photosensitive black glass-ceramic paste and the photosensitive white glass-ceramic paste, on a glass base, and laminating the mold with the glass base through the second paste to form a laminate; (c) irradiating the laminate with radiation to form a rib precursor molded article composed of two white and black layers; (d) removing the mold from the glass base and the rib precursor molded article to transfer the rib precursor molded article to the glass base; and (e) sintering the rib precursor molded article to for
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: November 23, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Takaki Sugimoto, Chikafumi Yokoyama, Akira Yoda
  • Publication number: 20040198131
    Abstract: A method of producing a substrate for a plasma display panel by providing a rib on a base, which comprises the steps of contacting a rib precursor containing a first photo-setting initiator having a first absorption edge and a first photo-setting component closely with said base; filling a mold, obtained by photo-setting of a second photo-setting initiator having a second absorption edge whose wavelength is shorter than a wavelength corresponding to said first absorption edge of said first photo-setting initiator, with said rib precursor, exposing said rib precursor to light having a wavelength longer than a wavelength corresponding to said second absorption edge, thereby setting said rib precursor, and removing said mold.
    Type: Application
    Filed: April 14, 2004
    Publication date: October 7, 2004
    Applicant: 3M Innovative Properties Company
    Inventor: Chikafumi Yokoyama
  • Publication number: 20040166760
    Abstract: An apparatus is provided for producing a substrate for PDP, which can easily reduce ununiformity of a dielectric layer and defects of ribs.
    Type: Application
    Filed: February 23, 2004
    Publication date: August 26, 2004
    Applicant: 3M Innovative Properties Company
    Inventors: Hiroshi Kikuchi, Chikafumi Yokoyama, Akira Yoda, Takaki Sugimoto, Toshihiro Suwa
  • Patent number: 6761607
    Abstract: An apparatus is provided for producing a substrate for PDP, which can easily reduce ununiformity of a dielectric layer and defects of ribs. The apparatus is so constituted that it comprises: a table for the plate, a rib precursor supplying portion for providing a precusor of the ribs on the plate, a pliable mold having at least groove portions provided in parallel with each other at a fixed distance, which is disposed on the precursor of the ribs provided on the plate, a mold pressing portion for applying a pressure to the mold, thereby to contact the mold closely with the plate via the precursor of the ribs, and a driving portion for moving the mold pressing portion along the groove portions of the mold.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: July 13, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Hiroshi Kikuchi, Chikafumi Yokoyama, Akira Yoda, Takaki Sugimoto, Toshihiro Suwa
  • Patent number: 6699927
    Abstract: A molding composition is provided that includes an inorganic component, an organic binder component, and a debinding catalyst. The molding composition is capable of lowering the sintering temperature, for example, when the molding composition is used to make ceramic microstructures such as barrier ribs for plasma display panels.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: March 2, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Chikafumi Yokoyama, Takaki Sugimoto, Chi-Hing Chiu
  • Publication number: 20030224688
    Abstract: A method of producing a rib for a plasma display panel substrate, which comprises the steps of: (a) partially filling a groove portion of a mold with a first photo-sensitive glass-ceramic paste selected from a photosensitive black glass-ceramic paste and a photosensitive white glass-ceramic paste, and curing the paste by irradiating with radiation; (b) supplying a second photosensitive glass-ceramic paste, which is different from the first photosensitive glass-ceramic paste, selected from the photosensitive black glass-ceramic paste and the photosensitive white glass-ceramic paste, on a glass base, and laminating the mold with the glass base through the second paste to form a laminate; (c) irradiating the laminate with radiation to form a rib precursor molded article composed of two white and black layers; (d) removing the mold from the glass base and the rib precursor molded article to transfer the rib precursor molded article to the glass base; and (e) sintering the rib precursor molded article to form a ri
    Type: Application
    Filed: October 25, 2002
    Publication date: December 4, 2003
    Inventors: Takaki Sugimoto, Chikafumi Yokoyama, Akira Yoda