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SUGIYAMA KEIJI

Overview
  • Total Patents
    13
About

SUGIYAMA KEIJI has a total of 13 patent applications. Its first patent ever was published in 1991. It filed its patents most often in United States and Japan. Its main competitors in its focus markets optics, audio-visual technology and transport are SIMMONS JOHN CASTLE, MEMSOLUTIONS INC and HU DARWIN.

Patent filings in countries

World map showing SUGIYAMA KEIJIs patent filings in countries
# Country Total Patents
#1 United States 11
#2 Japan 2

Patent filings per year

Chart showing SUGIYAMA KEIJIs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Sugiyama Keiji 13
#2 Yamamoto Kakuya 8
#3 Kurozuka Akira 5
#4 Kasazumi Kenichi 5
#5 Shikii Shinichi 4
#6 Itoh Tatsuo 3
#7 Hirai Junichi 2
#8 Takemura Masashi 1
#9 Hayashi Katsuhiko 1

Latest patents

Publication Filing date Title
US2012250306A1 Transmissive display device
JPH06310975A Frequency stabilizing method in wide temperature range for crystal oscillator and temperature compensation type crystal oscillator
JPH05102780A Frequency stabilizing method for crystal resonator and temperature compensation crystal resonator