Patents by Inventor Katuhiko Takahashi

Katuhiko Takahashi 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).

  • Electronic watt-hour meter
    Patent number: 5764523
    Abstract: In a method of calculating an electric power by digitalizing a voltage signal and a current signal of an electronic watt-hour meter and multiplying digitalized signals, precision of an electric power calculation is improved by a circuit arrangement suitable for use in an IC mainly composed of a digital circuit with a small analog scale. A voltage signal and a current signal are inputted into analog to digital conversion means composed of a sigma-delta modulation circuit and the like, respectively, and a moving average of outputs from the analog to digital conversion means is determined by moving average processing means as a low-pass filter and then voltages are multiplied by currents. An analog scale for sigma-delta modification is small. Additionally, the circuit arrangement is reduced by the employment of the low-pass filter due to the use of the moving average. Further, an electric power can be calculated with a high precision.
    Type: Grant
    Filed: November 4, 1994
    Date of Patent: June 9, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tooru Yoshinaga, Katuhiko Takahashi, Shinzou Tamai
  • Polybutylene terephthalate composition
    Patent number: 4742109
    Abstract: A polybutylene terephthalate composition comprises polybutylene terephthalate, polyacrylate and a silane coupling agent and is improved in impact resistance and elongation.
    Type: Grant
    Filed: January 30, 1986
    Date of Patent: May 3, 1988
    Assignee: Polyplastics Co., Ltd.
    Inventors: Katuhiko Takahashi, Yoshihisa Tajima
  • Process for preparing 4-oxopentadecanedioic acid
    Patent number: 4085274
    Abstract: 4-OXOPENTADECANEDIOIC ACID IS PREPARED BY OXIDIZING A .alpha.-CYCLODODEC-1-ENYLPROPIONIC ACID DERIVATIVE HAVING ONE OF THE FOLLOWING CHEMICAL FORMULAE AT ITS ETHYLENIC DOUBLE BOND WITH OZONE. ##STR1## The compound is useful as an intermediate for a musk perfume compound. The compound having the formula II is selectively prepared from cyclododecanone and di-alkyl succinate.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: April 18, 1978
    Assignee: Daicel Ltd.
    Inventors: Katuhiko Takahashi, Kyozo Arimoto, Yoshiyuki Arai, Tsuyoshi Morinaga, Yuji Nakazawa
  • 13-Oxabicyclo(10,4,0)hexadec-1(12)-en-14-one
    Patent number: 4005107
    Abstract: 13-Oxabicyclo(10.4.0)hexadec-1(12)-en-14-one is prepared by intramolecular cyclization of .beta.-(2-oxocyclododecyl) propionic acid, or derivatives thereof, in the presence of an acid catalyst or a basic catalyst. The compound is an important intermediate for producing musk perfume fragrance.
    Type: Grant
    Filed: November 6, 1975
    Date of Patent: January 25, 1977
    Assignee: Daicel, Ltd.
    Inventors: Tsuyoshi Morinaga, Yuji Nakazawa, Kyozo Arimoto, Katuhiko Takahashi, Yoshiyuki Arai