Inventor · disambiguated record
Keiji Matsui
Also filed as: MATSUI KEIJI
12 granted patents·285 citations·filing 1988–1997
93Inventor score
Top patents by PatentIndex Score
12 records- 0185US4948968AHigh resolution optical encoder having a long detection strokeSPECTRA INC·Filed 1989·Granted Aug 14, 1990·30 cites·15 claims
- 0283US4979827AOptical linear encoderOKUMA MACHINERY WORKS LTD·Filed 1989·Granted Dec 25, 1990·36 cites·10 claims
- 0382US5068530AOptical encoderOKUMA MACHINERY WORKS LTD·Filed 1990·Granted Nov 26, 1991·41 cites·7 claims
- 0481US4956553AOptical encoder with varying grating pitchOKUMA MACHINERY WORKS LTD·Filed 1989·Granted Sep 11, 1990·25 cites·15 claims
- 0580US5801378AOptical encoder diffraction gratings for eliminating diffracted light componentsOKUMA MACHINERY WORKS LTD·Filed 1997·Granted Sep 1, 1998·43 cites·13 claims
- 0673US5249032AOptical position-detecting apparatusOKUMA MACHINERY WORKS LTD·Filed 1991·Granted Sep 28, 1993·28 cites·7 claims
- 0759US5182613APosition detecting apparatus generating periodic detection signals having equal third and fifth harmonic componentsOKUMA MACHINERY WORKS LTD·Filed 1991·Granted Jan 26, 1993·17 cites·5 claims
- 0854US5260769APosition detectorOKUMA MACHINERY WORKS LTD·Filed 1992·Granted Nov 9, 1993·17 cites·5 claims
- 0953US4983900ALinear encoder with plural detectors for use with one or more main scalesOKUMA MACHINERY WORKS LTD·Filed 1989·Granted Jan 8, 1991·16 cites·5 claims
- 1051US5066129AOptical linear encoder with light quantity calabrationOKUMA MACHINERY WORKS LTD·Filed 1990·Granted Nov 19, 1991·13 cites·3 claims
- 1151US4950891AHigh resolution optical encoder having a long detection strokeOKUMA MACHINERY WORKS LTD·Filed 1988·Granted Aug 21, 1990·7 cites·14 claims
- 1245US5170221AParallel light ray measuring apparatusOKUMA MACHINERY WORKS LTD·Filed 1991·Granted Dec 8, 1992·12 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →