Inventor

Ryuji Tokuda

Inventor

Tokyo, JP

Overview

26→

Patents

1980–2005

Patent span

Physics

Primary field (CPC G)

Patents· 26 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G03Bprimary

G03BApparatus or arrangements for taking photographs or for projecting or viewing them47%

G02BOptical elements, systems or apparatus13%

G01SRadio direction-finding8%

G01CMeasuring distances, levels or bearings5%

G01RMeasuring electric variables5%

H05BElectric heating5%

G01JMeasurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics of infrared, visible or ultraviolet light3%

G05FSystems for regulating electric or magnetic variables3%

G08BSignalling systems, e.g. personal calling systems3%

H03FAmplifiers3%

PatentTitleYear

6,858,983'Display device having conical transparent members covering electroluminescent elements'2005 4,720,723'Distance measuring device'1988 4,701,048'Input circuit for distance measuring apparatus'1987 4,550,992'Motor drive control circuit'1985 4,547,770'Battery voltage checking apparatus'1985 4,544,254'Camera with a display device for displaying both object distance informations and coupling range informations'1985 4,542,970'Shutter release device'1985 4,537,489'Automatic focusing device'1985 4,512,643'Exposure control device for camera'1985 4,502,774'Battery check device for camera'1985 4,500,193'Indicating apparatus for camera'1985 4,482,238'Brightness warning device for camera'1984 4,482,236'Electrically operated camera and disabling device therefor'1984 4,479,708'Temperature compensation system of light measuring circuit'1984 4,459,574'Driving circuit for a coil'1984 4,453,812'Auto-focus device for camera'1984 4,429,967'Distance measuring system'1984 4,425,032'Cameras and circuits for sensing the action of camera shutters'1984 4,425,031'Automatic focus adjusting apparatus for camera'1984 4,415,249'Motor drive circuit for camera'1983 4,375,321'Exposure amount control device'1983 4,365,878'Signal processing circuitry for a distance measuring system'1982 4,350,418'Camera provided with automatic focus adjusting device'1982 4,317,070'Circuits for flash equipment'1982 4,300,824'Signal processing circuitry for a distance measuring system'1981 4,206,987'Exposure adjusting device for camera system'1980

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1980–2005Patents assigned to CANON KK (26)· patent assignee history

1980–1988Based in Tokyo, JP· patent location history

2005Based in Kanagawa, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
CANON KK	26	1980–2005

Locations

Location	Patents	Span
Tokyo, JP	25	1980–1988
Kanagawa, JP	1	2005