Inventor
Shigeo Tohyama
Inventor
Katsuta, JP
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G01Jprimary
G01JMeasurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics of infrared, visible or ultraviolet light33%
G01DMeasuring not specially adapted for a specific variable17%
G01LMeasuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure17%
G01NInvestigating or analysing materials by determining their chemical or physical properties17%
G01RMeasuring electric variables8%
G06KGraphical data reading8%
PatentTitleYear
4,810,089'Photoelastic effect measuring device'19894,786,802'Apparatus for measuring photoelasticity'19884,566,793'Recording apparatus for a spectrophotometer'19864,352,561'Calibrating apparatus in a monochromator'19824,325,634'Slit width calibrator for monochromator'19824,323,309'Spectro-photometer with arithmetic and control unit'19824,304,490'Spectrophotometer'19814,283,732'Recording system with inter-line space positioning means'19814,227,811'Spectrophotometer'1980Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1980–1989Patents assigned to HITACHI LTD (9)· patent assignee history
1980–1989Based in Katsuta, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI LTD | 9 | 1980–1989 |
Locations
| Location | Patents | Span |
|---|---|---|
| Katsuta, JP | 9 | 1980–1989 |