Patents by Inventor Takayuki Tsuru

Takayuki Tsuru 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).

  • Patent number: 6553274
    Abstract: A reticle is designed with a method including generating first dummy patterns with intervals from main patterns. Each of the first dummy patterns are divided into a plurality of spaced apart second dummy patterns and then each of the second dummy patterns are measured to find third dummy patterns having widths and areas below smallest allowable values. The third dummy patterns are then respectively connected to second dummy patterns which are adjacent to the third dummy patterns by generating a connecting dummy pattern. Selective non-connected third dummy patterns are removed. The first dummy patterns are divided into a plurality of second dummy patterns by vertical and horizontal strip lines crossing the first dummy patterns.
    Type: Grant
    Filed: January 14, 2000
    Date of Patent: April 22, 2003
    Assignee: Fujitsu Limited
    Inventors: Takushi Motoyama, Hideki Harada, Takayuki Tsuru
  • Patent number: 6099992
    Abstract: A reticle is designed with a method including a step of generating first dummy patterns with intervals from main patterns. Each of the first dummy patterns are divided into a plurality of spaced apart second dummy patterns and then each of the second dummy patterns are measured to find third dummy patterns having widths and areas below smallest allowable values. The third dummy patterns are then respectively connected to second dummy patterns which are adjacent to the third dummy patters by generating a connecting dummy pattern. Selective non-connected third dummy patterns are removed. The first dummy patterns are divided into a plurality of second dummy patterns by vertical and horizontal strip lines crossing the first dummy patterns.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: August 8, 2000
    Assignee: Fujitsu Limited
    Inventors: Takushi Motoyama, Hideki Harada, Takayuki Tsuru
  • Patent number: 5216296
    Abstract: A logic circuit in which first and second transistors are connected in series between high and low potential power sources with the middle point of the series connection used as the output terminal; A same- and inverse-phase signal generating unit is provided connected between the high and low potential power sources in parallel with the first and second transistors for generating same- and inverse-phase signals based on the single input signal output from the logic circuit. A transient signal generating unit is provided for generating transient large current signals at the rise time of the inverse-phase signals and generating transient cut-off signals at the fall time of the inverse-phase signals. The series connected first transistor is driven and controlled based on the regular-phase signals, while the second transistor is driven and controlled based on the transient large current signal and transient cut-off signal, thus producing an inverse-phase output by a simple circuit construction.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: June 1, 1993
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Tsunoi, Kazumasa Nawata, Toshiaki Sakai, Hiroki Yada, Hisayosi Ooba, Takayuki Tsuru, Satoru Sudo, Taichi Saitoh