Patents by Inventor Naohiro Hayakawa

Naohiro Hayakawa 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).

  • Super highly radiation-resistant grease
    Patent number: 4753741
    Abstract: A radiation-resistant grease that is stable under elevated temperatures is disclosed. The grease is prepared by mixing a bentonite-based thickening agent with a base oil composed of m-(m-phenoxyphenoxy)diphenyl, pentaphenyl ether, a monoalkyltriphenyl ether or a monoalkyltetraphenyl ether (provided that the alkyl group contains 6-20 carbon atoms). To the mixture is added, if necessary, a gelling aid composed of an aliphatic alcohol, an aliphatic ketone and/or an aliphatic carbonate ester.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: June 28, 1988
    Assignees: Japan Atomic Energy Research Institute, Matsumura Oil Research Corporation
    Inventors: Kazuo Arakawa, Tsuneo Sasuga, Miyuki Hagiwara, Naohiro Hayakawa, Kenzo Yoshida, Hiroshi Nakanishi, Mitsuo Hirohama, Tetsuya Yagi, Tamio Akada, Takao Soda
  • Radiation-resistant grease
    Patent number: 4711732
    Abstract: A radiation-resistant grease employed in various machines at nuclear facilities, based on (A) an oil principally composed of a phenoxyphenoxydiphenyl and a mono- and/or dialkyldiphenyl ether and (B) a bentonite based thickening agent, if necessary, together with (C) a gelling aid of alcohol, ketone, or carbonate ester.
    Type: Grant
    Filed: March 25, 1986
    Date of Patent: December 8, 1987
    Assignees: Japan Atomic Energy Research Institute, Matsumura Oil Research Corporation
    Inventors: Kazuo Arakawa, Naohiro Hayakawa, Kenzo Yoshida, Tetsuya Yagi, Hiroshi Nakanishi
  • Lubricating oil blend resistant to ionizing radiation
    Patent number: 4664829
    Abstract: An oil blend having resistance to ionizing radiation comprising the following components is herein disclosed:A. 25 to 75 wt % of 0-70 wt % of o-(m-phenoxyphenoxy)diphenyl and 100-30 wt % of m-(m-phenoxyphenoxy)diphenyl; andB. 75 to 25 wt % of a monoalkyldiphenyl ether or dialkyldiphenyl ether.This oil blend has a pour point of 0.degree. C. or below and has a G-value of 0.1 or lower for the evolution of decomposition gases under irradiation with ionizing radiation. Said ethers have 10 to 20 carbon atoms in the alkyl moiety.
    Type: Grant
    Filed: April 5, 1985
    Date of Patent: May 12, 1987
    Assignees: Japan Atomic Energy Research Institute, Matsumura Oil Research Corporation
    Inventors: Kazuo Arakawa, Naohiro Hayakawa, Kenzo Yoshida, Naoyuki Tamura, Hiroshi Nakanishi, Tetsuya Yagi, Shintaro Kuroiwa
  • Carrying case for a tool
    Patent number: D347731
    Type: Grant
    Filed: May 1, 1992
    Date of Patent: June 14, 1994
    Assignee: Makita Corporation
    Inventors: Naohiro Hayakawa, Hideo Ohta
  • Hedge trimmer
    Patent number: D372407
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: August 6, 1996
    Assignee: Makita Corporation
    Inventors: Koji Haneda, Naohiro Hayakawa
  • Flashlight
    Patent number: D375570
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: November 12, 1996
    Assignee: Makita Corporation
    Inventors: Naohiro Hayakawa, Akinori Kimata
  • Portable electric screwdriver
    Patent number: D384261
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: September 30, 1997
    Assignee: Makita Corporation
    Inventors: Naohiro Hayakawa, Shingo Umemura
  • Portable electric screwdriver
    Patent number: D384262
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: September 30, 1997
    Assignee: Makita Corporation
    Inventors: Naohiro Hayakawa, Shingo Umemura
  • Portable electric screwdriver
    Patent number: D386662
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: November 25, 1997
    Assignee: Makita Corporation
    Inventors: Katsumi Tozawa, Naohiro Hayakawa, Norifumi Niwa, Hiroshi Fujimoto
  • Miter saw
    Patent number: D388442
    Type: Grant
    Filed: December 17, 1996
    Date of Patent: December 30, 1997
    Assignee: Makita Corporation
    Inventors: Yoshinori Shibata, Naohiro Hayakawa
  • Portable electric drill
    Patent number: D403220
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: December 29, 1998
    Assignee: Makita Corporation
    Inventors: Akinori Kimata, Naohiro Hayakawa
  • Portable electric hammer
    Patent number: D409468
    Type: Grant
    Filed: March 18, 1998
    Date of Patent: May 11, 1999
    Assignee: Makita Corporation
    Inventors: Masaaki Uchida, Naohiro Hayakawa
  • Portable electric planer
    Patent number: D413779
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: September 14, 1999
    Assignee: Makita Corporation
    Inventors: Naohiro Hayakawa, Hirokazu Hagiwara
  • Portable electric driver
    Patent number: D426125
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: June 6, 2000
    Assignee: Makita Corporation
    Inventors: Naohiro Hayakawa, Yukihiko Yamada
  • Circular saw
    Patent number: D427874
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: July 11, 2000
    Assignee: Makita Corporation
    Inventors: Naohiro Hayakawa, Hideki Abe