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Inventor

Keiichi Matsumura

Inventor
Yokohama, JP

Overview

4→
Patents
1993–2021
Patent span
Physics
Primary field (CPC G)

Patents· 4 as inventor

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

G03Gprimary
G03GElectrography40%
C09KMaterials for miscellaneous applications, not provided for elsewhere20%
H04NPictorial communication, e.g. television20%
H10WGeneric packages, interconnections, connectors or other constructional details of devices covered by class h1020%
PatentTitleYear
11,124,701Phosphor particles20217,670,879'Manufacturing method of semiconductor module including solid-liquid diffusion joining steps'20105,848,325'Image forming apparatus'19985,237,382'Image forming apparatus and controller thereof'1993

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1993–1998Patents assigned to RICOH KK (2)· patent assignee history
1993–1998Based in Yokohama, JP· patent location history
2010Patents assigned to FUJI ELECTRIC HOLDINGS (1)· patent assignee history
2010Based in Tokyo, JP· patent location history
2021Patents assigned to SHINETSU CHEMICAL CO (1)· patent assignee history
2021Based in Annaka, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
RICOH KK21993–1998
FUJI ELECTRIC HOLDINGS12010
SHINETSU CHEMICAL CO12021
Locations
LocationPatentsSpan
Yokohama, JP21993–1998
Annaka, JP12021
Tokyo, JP12010