Patents by Inventor Mitsutaka Nakae

Mitsutaka Nakae 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).

  • Prism and method for producing the same
    Patent number: 7075740
    Abstract: A prism is produced by the steps of feeding a glass base material into a heating furnace, the glass base material having surfaces to be prism surfaces after forming, the Ra value of the surface roughness of the surface being less than the Ra value corresponding to #170, the glass base material having a predetermined dimensional ratio, grasping the glass base material with feeding means, and feeding the glass base material into a heating furnace to heat the glass base material to a temperature so that a minimum viscosity of the glass base material becomes equal to or more than 104 Pa·s and less than 106 Pa·s, drawing and forming the lower portion of the glass base material, and then cutting the glass base material to obtain a longer body having a desired dimension and prism surfaces with the Ra value of the surface roughness equal to or less than a quarter of the wavelength of incident light, and cutting the longer body into desired length.
    Type: Grant
    Filed: March 5, 2003
    Date of Patent: July 11, 2006
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Hirokazu Takeuchi, Nagaharu Nakajima, Tadashi Seto, Mitsutaka Nakae
  • Prism and method for producing the same
    Publication number: 20050122601
    Abstract: A prism is produced by the steps of feeding a glass base material into a heating furnace, the glass base material having surfaces to be prism surfaces after forming, the Ra value of the surface roughness of the surface being less than the Ra value corresponding to #170, the glass base material having a predetermined dimensional ratio, grasping the glass base material with feeding means, and feeding the glass base material into a heating furnace to heat the glass base material to a temperature so that a minimum viscosity of the glass base material becomes equal to or more than 104 Pa·s and less than 106 Pa·s, drawing and forming the lower portion of the glass base material, and then cutting the glass base material to obtain a longer body having a desired dimension and prism surfaces with the Ra value of the surface roughness equal to or less than a quarter of the wavelength of incident light, and cutting the longer body into desired length.
    Type: Application
    Filed: March 5, 2003
    Publication date: June 9, 2005
    Inventors: Hirokazu Takeuchi, Nagaharu Nakajima, Tadashi Seto, Mitsutaka Nakae