Patents by Inventor Takeaki Kumagai

Takeaki Kumagai 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: 20190107648
    Abstract: An optical element includes a substrate having an optically effective surface and an optically non-effective surface, and a light shielding film disposed over the optically non-effective surface. The optically non-effective surface has an inclined chamfer and a level chamfer that define a ridge portion. The ridge portion is coated with an aliphatic hydrocarbon.
    Type: Application
    Filed: October 4, 2018
    Publication date: April 11, 2019
    Inventors: Shuhei Yamamoto, Norihiko Ochi, Junri Ishikura, Takeaki Kumagai
  • Patent number: 9376553
    Abstract: A mixed material which includes a poly(methyl methacrylate) and inorganic fine particles which are surface-treated with a functional group having an amino group or a hexadecyl group or inorganic fine particles having hydrophilic surfaces and in which the content of the inorganic fine particles is 30 to 80 vol % is molded into an organic-inorganic composite molded product, and hence, a low coefficient of linear expansion in a range of 20 to 60 degrees Celsius, such as 20*10?6/degree Celsius or less, is realized.
    Type: Grant
    Filed: May 28, 2012
    Date of Patent: June 28, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takeaki Kumagai
  • Patent number: 9353247
    Abstract: The present invention relates to a molded article exhibiting a low linear expansion coefficient and a method of producing the molded article. The molded article is molded from a resin composition containing at least a thermoplastic cyclic olefin resin and silica particles surface-modified with amino functional groups and having a number average particle diameter of primary particles of 10 nm or more and 50 nm or less. The resin composition contains the silica particles in an amount of 34% by mass or more and 85% by mass or less.
    Type: Grant
    Filed: May 17, 2013
    Date of Patent: May 31, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takeaki Kumagai
  • Publication number: 20150111988
    Abstract: The present invention relates to a molded article exhibiting a low linear expansion coefficient and a method of producing the molded article. The molded article is molded from a resin composition containing at least a thermoplastic cyclic olefin resin and silica particles surface-modified with amino functional groups and having a number average particle diameter of primary particles of 10 nm or more and 50 nm or less. The resin composition contains the silica particles in an amount of 34% by mass or more and 85% by mass or less.
    Type: Application
    Filed: May 17, 2013
    Publication date: April 23, 2015
    Inventor: Takeaki Kumagai
  • Publication number: 20140142229
    Abstract: A mixed material which includes a poly(methyl methacrylate) and inorganic fine particles which are surface-treated with a functional group having an amino group or a hexadecyl group or inorganic fine particles having hydrophilic surfaces and in which the content of the inorganic fine particles is 30 to 80 vol % is molded into an organic-inorganic composite molded product, and hence, a low coefficient of linear expansion in a range of 20 to 60 degrees Celsius, such as 20*10?6/degree Celsius or less, is realized.
    Type: Application
    Filed: May 28, 2012
    Publication date: May 22, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Takeaki Kumagai
  • Publication number: 20140121289
    Abstract: An organic-inorganic composite molded product formed by molding a composite material of an organic resin and inorganic fine particles is provided, and in this molded product, the average primary particle diameter of the inorganic fine particles is 1 to 30 nm, the concentration of the inorganic fine particles is 25 to 50 percent by volume, and the porosity is 20 to 55 percent by volume. Accordingly, an organic-inorganic composite molded product having a small content of the inorganic fine particles and a significantly low average coefficient of linear expansion of 20*10?6 to ?110*10?6/degree Celsius can be manufactured.
    Type: Application
    Filed: May 28, 2012
    Publication date: May 1, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Shigeo Kiso, Katsumoto Hosokawa, Takeaki Kumagai, Takahiro Kojima, Emi Oishi
  • Publication number: 20090148693
    Abstract: An optical material includes a silsesquioxane compound having a polymerizable functional site, and silica fine particles. The total content of the silsesquioxane compound and the silica fine particles in the optical material is 95 percent by weight or more, and the average particle diameter of the silica fine particles is 1 nm or more and 100 nm or less.
    Type: Application
    Filed: December 3, 2008
    Publication date: June 11, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Takeaki Kumagai