Inventor

Tadayoshi Kitayama

Inventor

Tokyo, JP

Overview

21→

Patents

1990–2004

Patent span

Electricity

Primary field (CPC H)

Patents· 21 as inventor

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

H04Bprimary

H04BTransmission25%

H04JMultiplex communication20%

H01SDevices using the process of light amplification by stimulated emission of radiation [laser] to amplify or generate light18%

G02BOptical elements, systems or apparatus15%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein8%

G01JMeasurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics of infrared, visible or ultraviolet light5%

H04QSelecting5%

H04LTransmission of digital information, e.g. telegraphic communication3%

H04NPictorial communication, e.g. television3%

PatentTitleYear

6,801,720'Optical signal quality supervisory device'2004 6,445,478'Optical pulse position detecting circuit and an optical pulse generating apparatus and their methods'2002 6,434,288'Optical switching system'2002 6,292,603'Dispersion compensation device'2001 6,236,488'Optical pulse position detecting circuit and an optical pulse generating apparatus and their methods'2001 6,094,293'Optical switching apparatus for use in an optical communication system'2000 6,028,695'Optical modulating apparatus'2000 5,978,124'Light emitting control apparatus and optical transmitter'1999 5,861,967'Wavelength multiplexed light transfer unit and wavelength multiplexed light transfer system'1999 5,850,301'Wavelength multiplexed light transfer unit and wavelength multiplexed light transfer system'1998 5,793,908'Wavelength multiplexed light transfer unit and wavelength multiplexed light transfer system'1998 5,760,949'Light amplifier'1998 5,710,660'Gain-controllable optical amplifier and optical gain-control method'1998 5,510,930'Light amplifying apparatus'1996 5,506,724'Gain controllable optical amplifier and applications thereof'1996 5,455,704'Optical-fiber light amplifier'1995 5,400,163'Multiplex digital communication system for transmitting channel identification information'1995 5,367,587'Optical amplifier'1994 5,268,786'Optical fiber amplifier and its amplification method'1993 5,107,362'Optical transmission apparatus'1992 4,940,306'Star network optical transmission system'1990

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1990–2004Patents assigned to MITSUBISHI ELECTRIC CORP (21)· patent assignee history

1990–1996Based in Kanagawa, JP· patent location history

1994–1996Based in Kamakura, JP· patent location history

1996–2002Patents assigned to KOKUSAI DENSHIN DENWA CO LTD (6)· patent assignee history

1998–2004Based in Tokyo, JP· patent location history

1999Patents assigned to NIPPON TELEGRAPH & TELEPHONE (1)· patent assignee history

2002–2004Patents assigned to KDD CORP (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
MITSUBISHI ELECTRIC CORP	21	1990–2004
KOKUSAI DENSHIN DENWA CO LTD	6	1996–2002
KDD CORP	2	2002–2004
NIPPON TELEGRAPH & TELEPHONE	1	1999

Locations

Location	Patents	Span
Tokyo, JP	13	1998–2004
Kanagawa, JP	5	1990–1996
Kamakura, JP	3	1994–1996