Inventor
Keiji Matsui
Inventor
Niwa-gun, JP
Overview
Patents· 12 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G01Dprimary
G01DMeasuring not specially adapted for a specific variable65%
H03MCoding24%
G01BMeasuring length, thickness or similar linear dimensions6%
G01JMeasurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics of infrared, visible or ultraviolet light6%
PatentTitleYear
5,801,378'Optical encoder diffraction gratings for eliminating diffracted light components'19985,260,769'Position detector'19935,249,032'Optical position-detecting apparatus'19935,182,613'Position detecting apparatus generating periodic detection signals having equal third and fifth harmonic components'19935,170,221'Parallel light ray measuring apparatus'19925,068,530'Optical encoder'19915,066,129'Optical linear encoder with light quantity calabration'19914,983,900'Linear encoder with plural detectors for use with one or more main scales'19914,979,827'Optical linear encoder'19904,956,553'Optical encoder with varying grating pitch'19904,950,891'High resolution optical encoder having a long detection stroke'19904,948,968'High resolution optical encoder having a long detection stroke'1990Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1990–1998Patents assigned to OKUMA MACHINERY WORKS LTD (11)· patent assignee history
1990Patents assigned to SPECTRA INC (1)· patent assignee history
1990–1991Based in Aichi, JP· patent location history
1990–1991Based in Ooguchi, JP· patent location history
1991Based in Miwa, JP· patent location history
1992–1998Based in Niwa-gun, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| OKUMA MACHINERY WORKS LTD | 11 | 1990–1998 |
| SPECTRA INC | 1 | 1990 |
Locations
| Location | Patents | Span |
|---|---|---|
| Niwa-gun, JP | 5 | 1992–1998 |
| Aichi, JP | 3 | 1990–1991 |
| Ooguchi, JP | 3 | 1990–1991 |
| Miwa, JP | 1 | 1991 |