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Inventor

Eiichi Katoh

Inventor
Tokyo, JP

Overview

10→
Patents
1988–2020
Patent span
Physics
Primary field (CPC G)

Patents· 10 as inventor

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

G03Gprimary
G03GElectrography62%
G05BControl or regulating systems in general8%
G06FElectric digital data processing8%
G06NComputing arrangements based on specific computational models8%
G06QInformation and communication technology [ict] specially adapted for administrative, commercial, financial, managerial or supervisory purposes8%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests8%
PatentTitleYear
10,832,226System and service determination method20207,865,090'Maintenance management system and image forming apparatus'20115,198,861'Image density control method for an image forming apparatus for reducing background contamination of a photoconductive drum'19935,182,600'Toner end detecting method for an electrophotographic copier'19935,127,005'Fault diagnosis expert system'19924,965,637'Control device for an image forming apparatus'19904,959,687'Bias power source controller for an image forming apparatus'19904,952,976'Copier with a toner supply device'19904,916,491'Control device for a copier'19904,719,491'Copier'1988

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1988–1993Patents assigned to RICOH KK (8)· patent assignee history
1988–1993Based in Tokyo, JP· patent location history
1990Based in Yamato, JP· patent location history
1992Based in Yokohama, JP· patent location history
2011–2020Patents assigned to RICOH CO LTD (2)· patent assignee history
2011–2020Based in Kanagawa, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
RICOH KK81988–1993
RICOH CO LTD22011–2020
Locations
LocationPatentsSpan
Tokyo, JP61988–1993
Kanagawa, JP22011–2020
Yokohama, JP11992
Yamato, JP11990