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Inventor

Tohru Yamakawa

Inventor
Tokyo, JP

Overview

3→
Patents
1983–2021
Patent span
Performing operations
Primary field (CPC B)

Patents· 3 as inventor

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

B41Mprimary
B41MPrinting, duplicating, marking, or copying processes17%
B42DBooks17%
G03GElectrography17%
G11BInformation storage based on relative movement between record carrier and transducer17%
H04NPictorial communication, e.g. television17%
Y10TTechnical subjects covered by former us classification17%
PatentTitleYear
11,102,372Information recording body, medium and printed product202110,884,355Image forming apparatus20214,391,669'Device for making recording disc cartridge'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983Patents assigned to HITACHI MAXELL (1)· patent assignee history
1983Based in Muko, JP· patent location history
2021Patents assigned to DAINIPPON PRINTING CO LTD (1)· patent assignee history
2021Patents assigned to KYOCERA DOCUMENT SOLUTIONS INC (1)· patent assignee history
2021Based in Tokyo, JP· patent location history
2021Based in Osaka, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
DAINIPPON PRINTING CO LTD12021
HITACHI MAXELL11983
KYOCERA DOCUMENT SOLUTIONS INC12021
Locations
LocationPatentsSpan
Tokyo, JP12021
Osaka, JP12021
Muko, JP11983