Inventor

Yoshiaki Tachikawa

Inventor

Tokyo, JP

Overview

3→

Patents

1995–2000

Patent span

Physics

Primary field (CPC G)

Patents· 3 as inventor

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

G02Bprimary

G02BOptical elements, systems or apparatus40%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein20%

H01SDevices using the process of light amplification by stimulated emission of radiation [laser] to amplify or generate light20%

H04BTransmission20%

PatentTitleYear

6,157,025'Disk shaped tunable optical filter'2000 5,905,823'Polarization independent optical nonreciprocal circuit based on even mode to odd mode conversion'1999 5,414,548'Arrayed-wave guide grating multi/demultiplexer with loop-back optical paths'1995

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1995–2000Patents assigned to NIPPON TELEGRAPH & TELEPHONE (3)· patent assignee history

1995Based in Mito, JP· patent location history

1999–2000Based in Tokyo, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
NIPPON TELEGRAPH & TELEPHONE	3	1995–2000

Locations

Location	Patents	Span
Tokyo, JP	2	1999–2000
Mito, JP	1	1995