Keiichi Ohata

Person

Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Band control method and communication apparatus
- Patent number 8,045,580
- Issue date Oct 25, 2011
- NEC Corporation
- Yasuhiro Hamada
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Balun circuit and integrated circuit device
- Patent number 7,710,216
- Issue date May 4, 2010
- NEC Corporation
- Yasuhiro Hamada
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Dielectric resonator, dielectric resonator frequency adjusting meth...
- Patent number 7,378,925
- Issue date May 27, 2008
- NEC Corporation
- Masaharu Ito
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Dielectric waveguide filter with inductive windows and coplanar lin...
- Patent number 7,196,598
- Issue date Mar 27, 2007
- NEC Corporation
- Kenichi Maruhashi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Dielectric waveguide filter
- Patent number 7,170,373
- Issue date Jan 30, 2007
- NEC Corporation
- Masaharu Ito
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Dielectric waveguide filter with inductive windows and coplanar lin...
- Patent number 7,113,060
- Issue date Sep 26, 2006
- NEC Corporation
- Masaharu Ito
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
High frequency circuit substrate and method for forming the same
- Patent number 6,903,700
- Issue date Jun 7, 2005
- NEC Corporation
- Kenichi Maruhashi
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
RF package with multi-layer substrate having coplanar feed through...
- Patent number 6,774,748
- Issue date Aug 10, 2004
- NEC Corporation
- Masaharu Ito
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Multi-layer substrate suppressing an unwanted transmission mode
- Patent number 6,674,347
- Issue date Jan 6, 2004
- NEC Corporation
- Kenichi Maruhashi
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Coplanar transmission line
- Patent number 6,518,864
- Issue date Feb 11, 2003
- NEC Corporation
- Masaharu Ito
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Substrate-type non-reciprocal circuit element and integrated circui...
- Patent number 6,437,654
- Issue date Aug 20, 2002
- NEC Corporation
- Kenichi Maruhashi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Microwave and millimeter wave circuit apparatus
- Patent number 6,320,543
- Issue date Nov 20, 2001
- NEC Corporation
- Keiichi Ohata
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
High speed semiconductor device and an optelectronic device
- Patent number 5,111,256
- Issue date May 5, 1992
- NEC Corporation
- Keiichi Ohata
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Process of fabricating a heterojunction field effect transistor
- Patent number 5,026,655
- Issue date Jun 25, 1991
- NEC Corporation
- Keiichi Ohata
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Moelcular beam epitaxy for selective epitaxial growth of III - V co...
- Patent number 4,948,751
- Issue date Aug 14, 1990
- NEC Corporation
- Akihiko Okamoto
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Heterojunction transistor having bipolar characteristics
- Patent number 4,903,091
- Issue date Feb 20, 1990
- NEC Corporation
- Toshio Baba
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Heterojunction field effect transistor device and process of fabric...
- Patent number 4,893,155
- Issue date Jan 9, 1990
- General Electric Company
- Keiichi Ohata
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
High speed and power transistor
- Patent number 4,839,703
- Issue date Jun 13, 1989
- NEC Corporation
- Keiichi Ohata
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Indium-phosphide hetero-MIS-gate field effect transistor
- Patent number 4,837,605
- Issue date Jun 6, 1989
- NEC Corporation
- Kensuke Kasahara
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Double heterojunction semiconductor device with injector
- Patent number 4,727,403
- Issue date Feb 23, 1988
- NEC Corporation
- Hikaru Hida
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Field-effect transistor having a channel region of a Group III-V co...
- Patent number 4,556,895
- Issue date Dec 3, 1985
- NEC Corporation
- Keiichi Ohata
- H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents

Information Patent Application
BAND CONTROL METHOD AND COMMUNICATION APPARATUS
- Publication number 20090238206
- Publication date Sep 24, 2009
- NEC CORPORATION
- Yasuhiro Hamada
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
BALUN CIRCUIT AND INTEGRATED CIRCUIT DEVICE
- Publication number 20090115548
- Publication date May 7, 2009
- NEC Corporation
- Yasuhiro Hamada
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Feeder waveguide and sector antenna
- Publication number 20060244671
- Publication date Nov 2, 2006
- NEC Corporation
- Keiichi Ohata
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Negative-resistance circuit and active filter
- Publication number 20060044055
- Publication date Mar 2, 2006
- Masaharu Ito
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Dielectric waveguide filter
- Publication number 20050156688
- Publication date Jul 21, 2005
- NEC Corporation
- Masaharu Ito
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Filter
- Publication number 20030156806
- Publication date Aug 21, 2003
- Kenichi Maruhashi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Filter
- Publication number 20030155865
- Publication date Aug 21, 2003
- Masaharu Ito
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
High frequency circuit substrate and method for forming the same
- Publication number 20020158722
- Publication date Oct 31, 2002
- Kenichi Maruhashi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
MICROWAVE-MILLIMETER WAVE CIRCUIT APPARATUS AND FABRICATION METHOD...
- Publication number 20020093392
- Publication date Jul 18, 2002
- KEIICHI OHATA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
SUBSTRATE-TYPE NON-RECIPROCAL CIRCUIT ELEMENT AND INTEGRATED CIRCUI...
- Publication number 20010028280
- Publication date Oct 11, 2001
- KENICHI MARUHASHI
- H01 - BASIC ELECTRIC ELEMENTS

Keiichi Ohata

Person

Patents Grantslast 30 patents

Band control method and communication apparatus

Balun circuit and integrated circuit device

Dielectric resonator, dielectric resonator frequency adjusting meth...

Dielectric waveguide filter with inductive windows and coplanar lin...

Dielectric waveguide filter

Dielectric waveguide filter with inductive windows and coplanar lin...

High frequency circuit substrate and method for forming the same

RF package with multi-layer substrate having coplanar feed through...

Multi-layer substrate suppressing an unwanted transmission mode

Coplanar transmission line

Substrate-type non-reciprocal circuit element and integrated circui...

Microwave and millimeter wave circuit apparatus

High speed semiconductor device and an optelectronic device

Process of fabricating a heterojunction field effect transistor

Moelcular beam epitaxy for selective epitaxial growth of III - V co...

Heterojunction transistor having bipolar characteristics

Heterojunction field effect transistor device and process of fabric...

High speed and power transistor

Indium-phosphide hetero-MIS-gate field effect transistor

Double heterojunction semiconductor device with injector

Field-effect transistor having a channel region of a Group III-V co...

Patents Applicationslast 30 patents

BAND CONTROL METHOD AND COMMUNICATION APPARATUS

BALUN CIRCUIT AND INTEGRATED CIRCUIT DEVICE

Feeder waveguide and sector antenna

Negative-resistance circuit and active filter

Dielectric waveguide filter

Filter

Filter

High frequency circuit substrate and method for forming the same

MICROWAVE-MILLIMETER WAVE CIRCUIT APPARATUS AND FABRICATION METHOD...

SUBSTRATE-TYPE NON-RECIPROCAL CIRCUIT ELEMENT AND INTEGRATED CIRCUI...