Patents by Inventor Ken KIKKAWA

Ken KIKKAWA 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).

  • Optical glass, preform, and optical element
    Patent number: 10689289
    Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: June 23, 2020
    Assignee: OHARA INC.
    Inventors: Ken Kikkawa, Atsushi Nagaoka
  • OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT
    Publication number: 20200024179
    Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.
    Type: Application
    Filed: September 10, 2019
    Publication date: January 23, 2020
    Inventors: Ken KIKKAWA, Atsushi NAGAOKA
  • Optical glass, preform, and optical element
    Patent number: 10370289
    Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: August 6, 2019
    Assignee: OHARA INC.
    Inventors: Ken Kikkawa, Atsushi Nagaoka
  • Optical glass, preform, and optical element
    Patent number: 10189740
    Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mol %, comprises 20.0 to 65.0% of an SiO2 component, 1.0 to 25.0% of an Nb2O5 component, and 1.0 to 35.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: January 29, 2019
    Assignee: OHARA INC.
    Inventors: Ken Kikkawa, Atsushi Nagaoka
  • OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT
    Publication number: 20180057394
    Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.
    Type: Application
    Filed: October 18, 2017
    Publication date: March 1, 2018
    Inventors: Ken KIKKAWA, Atsushi NAGAOKA
  • OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT
    Publication number: 20170129801
    Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mol %, comprises 20.0 to 65.0% of an SiO2 component, 1.0 to 25.0% of an Nb2O5 component, and 1.0 to 35.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.
    Type: Application
    Filed: November 3, 2016
    Publication date: May 11, 2017
    Inventors: Ken KIKKAWA, Atsushi NAGAOKA
  • OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT
    Publication number: 20170129802
    Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.
    Type: Application
    Filed: November 9, 2016
    Publication date: May 11, 2017
    Inventors: Ken KIKKAWA, Atsushi NAGAOKA