Inventor

Takafumi Chiba

Inventor

Ibaraki, JP

Overview

7→

Patents

2003–2021

Patent span

Physics

Primary field (CPC G)

Patents· 7 as inventor

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

G02Bprimary

G02BOptical elements, systems or apparatus60%

G01JMeasurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics of infrared, visible or ultraviolet light10%

G01NInvestigating or analysing materials by determining their chemical or physical properties10%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein10%

H04JMultiplex communication10%

PatentTitleYear

11,125,925Optical element2021 6,980,707'Waveguide type variable optical attenuator'2005 6,947,631'Waveguide-type optical multiplexer/demultiplexer'2005 6,724,954'Optical multiplexer/demultiplexer'2004 6,643,427'Waveguide-arrayed optical wavelength multiplexer/demultiplexer and fabrication method of the same'2003 6,631,223'Optical multiplexer/demultiplexer'2003 6,556,749'Array waveguide grating and method of manufacture thereof'2003

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2003–2005Patents assigned to HITACHI CABLE (5)· patent assignee history

2003–2004Based in Ibaraki, JP· patent location history

2003Based in Hitachi, JP· patent location history

2004Patents assigned to HITACHI CABLE INC (1)· patent assignee history

2005Based in Tokyo, JP· patent location history

2021Patents assigned to AUTOCLONING TECH LTD (1)· patent assignee history

2021Patents assigned to PHOTONIC LATTICE INC (1)· patent assignee history

2021Patents assigned to SOPHIA SCHOOL CORP (1)· patent assignee history

2021Based in Sendai, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI CABLE	5	2003–2005
AUTOCLONING TECH LTD	1	2021
HITACHI CABLE INC	1	2004
PHOTONIC LATTICE INC	1	2021
SOPHIA SCHOOL CORP	1	2021

Locations

Location	Patents	Span
Ibaraki, JP	3	2003–2004
Tokyo, JP	2	2005
Sendai, JP	1	2021
Hitachi, JP	1	2003