Patents by Inventor Masafumi Yamamoto

Masafumi Yamamoto 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).

  • Semiconductor laser beam source apparatus
    Patent number: 4958893
    Abstract: In a semiconductor laser beam source apparatus, laser beams emitted by a plurality of semiconductor lasers, collimated and made parallel to each other are coalesced by a converging lens. The laser beams are respectively reflected by a plurality of reflecting mirrors having reflecting surfaces parallel to each other and guided to the converging lens. The reflecting mirrors respectively have a mounting surface at a predetermined angle with respect to the reflecting surface and are secured to a common plane.
    Type: Grant
    Filed: March 7, 1986
    Date of Patent: September 25, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masaru Noguchi, Masafumi Yamamoto
  • Process for producing an alumina-silica-chromia ternary fiber
    Patent number: 4906426
    Abstract: A process for producing an improved quality alumina-silica-chromia fiber from a mixture of an alumina powder, a silica powder and a powder of a solid solution of chromia in alumina, providing a flowing melt, and forming fibers.
    Type: Grant
    Filed: February 8, 1989
    Date of Patent: March 6, 1990
    Inventor: Masafumi Yamamoto
  • Laser beam scanning system
    Patent number: 4873435
    Abstract: A laser beam emitted from a laser source is deflected by a light deflector such as a rotational polygonal mirror or a galvanometer mirror to scan a surface-to-be-scanned. A beam position detector detects the incident position of the laser beam on the light deflector, and a control circuit drives an optical path changing mechanism according to the output of the beam position detector to change the optical path of the laser beam upstream of the light deflector so that the laser beam impinges upon the light deflector at the regular position.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: October 10, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shuji Ono, Masafumi Yamamoto
  • Process for producing improved ceramic fiber moldings
    Patent number: 4735757
    Abstract: A process for producing an improved ceramic fiber molding by submersing the molding into a suspension containing colloidal silica and/or colloidal alumina and chromium oxide powder. The chromium oxide is deposited onto the ceramic fibers thereby increasing the molding's resistance to linear shrinkage and corrosion when subjected to high temperatures.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: April 5, 1988
    Assignee: Isolite Babcock Refractories Co., Ltd.
    Inventors: Masafumi Yamamoto, Tatsuo Fukuzaki
  • Ceramic fiber moldings
    Patent number: 4668590
    Abstract: A process for producing an improved ceramic fiber molding by submersing the molding into a suspension containing colloidal silica and/or colloidal alumina and chromium oxide powder. The chromium oxide is deposited onto the ceramic fibers thereby increasing the molding's resistance to linear shrinkage and corrosion when subjected to high temperatures.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: May 26, 1987
    Assignee: Isolite Babcock Refractories Co., Ltd.
    Inventors: Masafumi Yamamoto, Tatsuo Fukuzaki
  • Process for manufacturing ceramic fibers consisting mainly of alumina and silica
    Patent number: 4511664
    Abstract: A mixture containing 35 to 65% by weight of Al.sub.2 O.sub.3, 30 to 60% by weight of SiO.sub.2, 1.5 to 4% by weight of Cr.sub.2 O.sub.3, and 0.01 to 0.1% by weight of carbon, the balance being unavoidable impurities, is melted, and amorphous fibers are formed from said molten material by blowing or spinning. The fibers are heated rapidly to a temperature of 950.degree. C. to 1,150.degree. C., held at that temperature for several to about a dozen minutes, and cooled rapidly to ordinary room temperature.
    Type: Grant
    Filed: June 4, 1984
    Date of Patent: April 16, 1985
    Assignee: Isolite Babcock Refractories Co., Ltd.
    Inventor: Masafumi Yamamoto