Patents by Inventor Bunichi Rai

Bunichi Rai 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: 20170232776
    Abstract: This disclosure relates to a spindle cover comprising a non-thermoplastic polyimide, wherein the spindle cover has a wall thickness in a range from about 1 mm to about 10 mm.
    Type: Application
    Filed: October 1, 2014
    Publication date: August 17, 2017
    Applicant: E.I. Du Pont de Nemours and Company
    Inventors: Isao Fukazu, Shinichi Nakagawa, Bunichi Rai
  • Publication number: 20160096357
    Abstract: This disclosure relates to a spindle disc assembly comprising: a spindle disc having a plurality of spindle assemblies disposed along the periphery of the spindle disc, the spindle assemblies each comprising a spindle cover, wherein the spindle cover has a wall thickness in a range from about 1 mm to about 10 mm, and wherein the spindle cover comprises a non-thermoplastic polyimide.
    Type: Application
    Filed: October 1, 2014
    Publication date: April 7, 2016
    Inventors: ISAO FUKAZU, SHIN-ICHI NAKAGAWA, BUNICHI RAI
  • Publication number: 20160096356
    Abstract: This disclosure relates to a spindle assembly comprising: a spindle; and a spindle cover thereon, wherein the spindle cover has a wall thickness (T) in a range from about 1 mm to about 10 mm, and wherein the spindle cover comprises a non-thermoplastic polyimide.
    Type: Application
    Filed: October 1, 2014
    Publication date: April 7, 2016
    Inventors: Isao Fukazu, SHIN-ICHI NAKAGAWA, BUNICHI RAI
  • Publication number: 20120196974
    Abstract: A cured perfluoroelastomer diaphragm comprises A) perfluoroelastomer and B) 10 to 50 parts by weight, per hundred parts by weight perfluoroelastomer, of carbon black a nitrogen adsorption specific area of 70-150 m2/g and a dibutyl phthalate absorption of 90-180 ml/100 g.
    Type: Application
    Filed: August 8, 2011
    Publication date: August 2, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: KAORI IWAMOTO, BUNICHI RAI
  • Patent number: 8075992
    Abstract: Cured perfluoroelastomer articles are disclosed which have improved surface characteristics. The articles are coated with a thin durable film comprising a fluorocarbon telomer which reduces surface stickiness, while maintaining the sealing properties of the article.
    Type: Grant
    Filed: March 4, 2008
    Date of Patent: December 13, 2011
    Assignee: DuPont Performance Elastomers LLC
    Inventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
  • Patent number: 7964001
    Abstract: Disclosed herein is a fuel management system having at least one fluororubber article in contact with biodiesel fuel wherein said fluororubber article comprises i) a polyhydroxy cured fluoroelastomer comprising copolymerized units of vinylidene fluoride and at least one other fluoromonomer, and ii) 1 to 10 parts by weight of a diester of a dicarboxylic acid per hundred parts fluoroelastomer. Also disclosed is a method for reducing volume swell of a polyhydroxy cured fluororubber article in contact with biodiesel fuel wherein 1 to 10 parts by weight of a diester of a dicarboxylic acid is incorporated into said article.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: June 21, 2011
    Assignee: DuPont Performance Elastomers L.L.C.
    Inventors: Shuichi Okutsu, Bunichi Rai
  • Publication number: 20100261849
    Abstract: Disclosed herein is a fuel management system having at least one fluororubber article in contact with biodiesel fuel wherein said fluororubber article comprises i) a polyhydroxy cured fluoroelastomer comprising copolymerized units of vinylidene fluoride and at least one other fluoromonomer, and ii) 1 to 10 parts by weight of a diester of a dicarboxylic acid per hundred parts fluoroelastomer. Also disclosed is a method for reducing volume swell of a polyhydroxy cured fluororubber article in contact with biodiesel fuel wherein 1 to 10 parts by weight of a diester of a dicarboxylic acid is incorporated into said article.
    Type: Application
    Filed: April 14, 2009
    Publication date: October 14, 2010
    Inventors: Shuichi Okutsu, Bunichi Rai
  • Publication number: 20090315277
    Abstract: A resilient seal element for use in an annular groove of dovetail configuration comprising, in cross section, a base and two sidewalls of equal length being connected by a convex arc.
    Type: Application
    Filed: June 23, 2008
    Publication date: December 24, 2009
    Inventors: Kaori Iwamoto, Bunichi Rai
  • Publication number: 20080154003
    Abstract: Cured perfluoroelastomer articles are disclosed which have improved surface characteristics. The articles are coated with a thin durable film comprising a fluorocarbon telomer which reduces surface stickiness, while maintaining the sealing properties of the article.
    Type: Application
    Filed: March 4, 2008
    Publication date: June 26, 2008
    Inventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
  • Publication number: 20060051570
    Abstract: Cured perfluoroelastomer articles are disclosed which have improved surface characteristics. The articles are coated with a thin durable film comprising a fluorocarbon telomer which reduces surface stickiness, while maintaining the sealing properties of the article.
    Type: Application
    Filed: August 19, 2005
    Publication date: March 9, 2006
    Inventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
  • Patent number: 6946511
    Abstract: Elastomeric parts having a magnetic flux density of at least 10 gauss on their surface deflect a portion of reactive plasmas from contact with the surface of the parts. Thus, such parts may be exposed to reactive plasmas for longer periods, with less degradation, than may similar elastomer parts that do not have such a magnetic flux density on their surface.
    Type: Grant
    Filed: October 20, 2003
    Date of Patent: September 20, 2005
    Assignee: DuPont Dow Elastomers, LLC
    Inventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
  • Patent number: 6830808
    Abstract: Cured perfluoroelastomer articles are disclosed which have improved surface characteristics. The articles are coated with a thin durable film comprising a polysiloxane and urethane oligomer which reduces surface stickiness, while maintaining the sealing properties of the article.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: December 14, 2004
    Assignee: Dupont Dow Elastomers, LLC
    Inventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
  • Publication number: 20040152827
    Abstract: Elastomeric parts having a magnetic flux density of at least 10 gauss on their surface deflect a portion of reactive plasmas from contact with the surface of the parts. Thus, such parts may be exposed to reactive plasmas for longer periods, with less degradation, than may similar elastomer parts that do not have such a magnetic flux density on their surface.
    Type: Application
    Filed: October 20, 2003
    Publication date: August 5, 2004
    Inventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
  • Publication number: 20040071975
    Abstract: Cured perfluoroelastomer articles are disclosed which have improved surface characteristics. The articles are coated with a thin durable film comprising a polysiloxane and urethane oligomer which reduces surface stickiness, while maintaining the sealing properties of the article.
    Type: Application
    Filed: July 2, 2003
    Publication date: April 15, 2004
    Inventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
  • Patent number: 6503972
    Abstract: A highly durable, high whiteness elastomer seal material molded from a composition comprising a perfluoroelastomer and a white pigment and having a surface with a whiteness of at least 90 as expressed by a W (Lab) color expression system under the conditions of a 2 degree field of view and a C-light source.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: January 7, 2003
    Assignee: DuPont Dow Elastomers, L.L.C.
    Inventors: Bunichi Rai, Shinichi Sogo