Patents by Inventor Nobuhiro Nozawa

Nobuhiro Nozawa 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
    Patent number: 4771020
    Abstract: An optical glass which is a P.sub.2 O.sub.5 system glass including ingredients selected from two groups of R.sub.2 O.sub.3 ingredients of specific contents have excellent resistivity to devitrification, homogeneity, light transmissivity and chemical durability.
    Type: Grant
    Filed: July 31, 1987
    Date of Patent: September 13, 1988
    Assignee: Kabushiki Kaisha Ohara
    Inventors: Hajime Omata, Nobuhiro Nozawa
  • Ophthalmic and optical glass
    Patent number: 4732876
    Abstract: An Ophthalmic and optical glass which is a B.sub.2 O.sub.3 - SiO.sub.2 - Li.sub.2 O - CaO - La.sub.2 O.sub.3 - TiO.sub.2 - ZrO.sub.2 -Nb.sub.2 O.sub.5 system in which relatively large amounts of B.sub.2 O.sub.3 and La.sub.2 O.sub.3 ingredients coexist has improved resistivity to devitrification while maintaining desirable optical constants, i.e., a refractive index (.eta.d) in the range of 1.75 to 1.84, Abbe number (.nu.d) in the range of 33 to 40 and specific gravity of 4.0 or less. Besides, the range of content of the Li.sub.2 O ingredient which is effective for the chemical strengthening treatment can be enlarged by this system of glass.
    Type: Grant
    Filed: May 28, 1987
    Date of Patent: March 22, 1988
    Assignee: Kabushiki Kaisha Ohara
    Inventors: Izumi Nagamine, Nobuhiro Nozawa
  • Fluoride glass
    Patent number: 4358543
    Abstract: A fluoride glass basically containing ingredients of a P-Si-Al-alkaline-earth metals-alkali metals-F system within specific content ranges has extremely high anomalous partial dispersion and low dispersion properties and is stable without tendency to devitrification.
    Type: Grant
    Filed: September 18, 1980
    Date of Patent: November 9, 1982
    Assignee: Kabushika Kaisha Ohara Kogaku Garasu Seizosho
    Inventor: Nobuhiro Nozawa
  • Optical glass
    Patent number: 4111707
    Abstract: An optical glass consisting essentially of a B.sub.2 O.sub.3 -SiO.sub.2 -La.sub.2 O.sub.3 -Gd.sub.2 O.sub.3 -Y.sub.2 O.sub.3 system and additionally containing ZrO.sub.2 has high refractive and low dispersive characteristics and is free of a poisonous thorium oxide ingredient.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: September 5, 1978
    Assignee: Kabushiki Kaisha Ohara Kogaku Garasu Seizosho
    Inventors: Fujio Komorita, Nobuhiro Nozawa, Satoshi Inoue