Patents Assigned to Asahi Kogaku K.K.
  • Process for producing shaped article of oriented calcium phosphate type compound
    Patent number: 5240659
    Abstract: An oriented shaped article of a calcium phosphate type compound is disclosed, in which at least two crystallographic axes of the primary particles of which the shaped article is composed each is oriented in one direction, respectively, in at least the surface of said article. A sinter of the oriented shaped article and a processes for producing the article and the sinter are also disclosed.
    Type: Grant
    Filed: March 24, 1992
    Date of Patent: August 31, 1993
    Assignee: Asahi Kogaku K.K.
    Inventors: Takeshi Ichitsuka, Tetsuro Ogawa, Masaya Sumita, Akihiko Yokoo
  • Optical system for use with a viewfinder
    Patent number: 5136427
    Abstract: An optical system for use in conjunction with a camera viewfinder having a penta-mirror comprises a positive first lens element and a negative second lens element satisfying predetermined conditions.
    Type: Grant
    Filed: July 9, 1990
    Date of Patent: August 4, 1992
    Assignee: Asahi Kogaku K.K.
    Inventor: Saburo Sugawara
  • Averaging circuit
    Patent number: 4523108
    Abstract: An averaging circuit includes a number of sample/hold circuits which cyclically sample/hold an input signal, the outputs of the sample hold circuits being added and applied to a comparator. A further sample/hold circuit sample/holds an internal input signal at an increased rate and the output thereof is amplified by a factor equal to the number of cyclically operated sample/hold circuits before being applied as the other input to the comparator.
    Type: Grant
    Filed: July 21, 1982
    Date of Patent: June 11, 1985
    Assignee: Asahi Kogaku K.K.K.
    Inventors: Masaaki Niiho, Takuo Itagaki