Inventor

Masafumi Koga

Inventor

Yokosuka, JP

Overview

8→

Patents

1992–2011

Patent span

Electricity

Primary field (CPC H)

Patents· 8 as inventor

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

G02Bprimary

G02BOptical elements, systems or apparatus21%

H04BTransmission21%

H04JMultiplex communication21%

H04QSelecting14%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein7%

G06NComputing arrangements based on specific computational models7%

H04LTransmission of digital information, e.g. telegraphic communication7%

PatentTitleYear

7,970,008'Multiplexing transmission system and multiplexing transmission method'2011 6,626,590'Optical communication network'2003 6,545,780'Wavelength allocation method, a transmission equipment and receiving equipment using this method and a wavelength division multiplex transmission system'2003 5,917,649'Device and a method for evaluating an optical amplifier'1999 5,754,320'Optical cross-connect system'1998 5,617,234'Multiwavelength simultaneous monitoring circuit employing arrayed-waveguide grating'1997 5,204,771'Optical circulator'1993 5,099,114'Optical wavelength demultiplexer'1992

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1992–2011Patents assigned to NIPPON TELEGRAPH & TELEPHONE (8)· patent assignee history

1992–2011Based in Yokosuka, JP· patent location history

1999Patents assigned to ANDO ELECTRIC (1)· patent assignee history

2003Based in Tokyo, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
NIPPON TELEGRAPH & TELEPHONE	8	1992–2011
ANDO ELECTRIC	1	1999

Locations

Location	Patents	Span
Yokosuka, JP	7	1992–2011
Tokyo, JP	1	2003