Masao Kawachi

Person

Mito, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical wavelength division multiplexing transmission network syste...
- Patent number 6,643,463
- Issue date Nov 4, 2003
- Nippon Telegraph and Telephone Corporation
- Senichi Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical signal processor, method of its control, method of its desi...
- Patent number 5,572,611
- Issue date Nov 5, 1996
- Nippon Telegraph & Telephone Corporation
- Kaname Jinguji
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Integrated optical waveguide circuit and optical branch line test s...
- Patent number 5,546,483
- Issue date Aug 13, 1996
- Nippon Telegraph & Telephone Corporation
- Yasuyuki Inoue
- G02 - OPTICS
Information Patent Grant
Compact optical switching module including thin-film heaters and tr...
- Patent number 5,513,285
- Issue date Apr 30, 1996
- Oki Electric Industry Co. Ltd.
- Toshiyuki Kawashima
- G02 - OPTICS
Information Patent Grant
Arrayed-wave guide grating multi/demultiplexer with loop-back optic...
- Patent number 5,414,548
- Issue date May 9, 1995
- Nippon Telegraph & Telephone Corporation
- Yoshiaki Tachikawa
- G02 - OPTICS
Information Patent Grant
Waveguide-type optical matrix switch
- Patent number 5,247,594
- Issue date Sep 21, 1993
- Nippon Telegraph & Telephone Corporation
- Masayuki Okuno
- G02 - OPTICS
Information Patent Grant
Automated optical main distributing frame system
- Patent number 5,204,921
- Issue date Apr 20, 1993
- Nippon Telegraph & Telephone Corporation
- Tsuneo Kanai
- G02 - OPTICS
Information Patent Grant
Guided-wave optical branching device
- Patent number 5,165,001
- Issue date Nov 17, 1992
- Nippon Telegraph & Telephone Corporation
- Akihiro Takagi
- G02 - OPTICS
Information Patent Grant
Guided-wave optical circuit and method for adjusting a characterist...
- Patent number 5,117,470
- Issue date May 26, 1992
- Nippon Telegraph & Telephone Corporation
- Yasuyuki Inoue
- G02 - OPTICS
Information Patent Grant
Guided-wave optical branching components and optical switches
- Patent number 5,044,715
- Issue date Sep 3, 1991
- Nippon Telegraph & Telephone Corporation
- Masao Kawachi
- G02 - OPTICS
Information Patent Grant
Integrated optical device and method for manufacturing thereof
- Patent number 4,978,188
- Issue date Dec 18, 1990
- Nippon Telegraph & Telephone Corporation
- Masao Kawachi
- G02 - OPTICS
Information Patent Grant
Integrated optical device and method for manufacturing thereof
- Patent number 4,900,112
- Issue date Feb 13, 1990
- Nippon Telegraph & Telephone Corporation
- Masao Kawachi
- G02 - OPTICS
Information Patent Grant
Method for making single-polorization, single mode optical fibers
- Patent number 4,838,916
- Issue date Jun 13, 1989
- Nippon Telegraph & Telephone Public Corporation
- Takao Edahiro
- G02 - OPTICS
Information Patent Grant
Single mode channel optical waveguide with a stress-induced birefri...
- Patent number 4,781,424
- Issue date Nov 1, 1988
- Nippon Telegraph & Telephone Corporation
- Masao Kawachi
- G02 - OPTICS
Information Patent Grant
Hybrid optical integrated circuit
- Patent number 4,750,799
- Issue date Jun 14, 1988
- Nippon Telegraph & Telephone Corporation
- Masao Kawachi
- G02 - OPTICS
Information Patent Grant
Method for fabricating hybrid optical integrated circuit
- Patent number 4,735,677
- Issue date Apr 5, 1988
- Nippon Telegraph & Telephone Corporation
- Masao Kawachi
- G02 - OPTICS
Information Patent Grant
Core torch for fabricating single-mode optical fiber preforms
- Patent number 4,406,684
- Issue date Sep 27, 1983
- Nippon Telegraph & Telephone Public Corporation
- Masao Kawachi
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Method of fabricating multi-mode optical fiber preforms
- Patent number 4,367,085
- Issue date Jan 4, 1983
- Nippon Telegraph & Telephone Public Corporation
- Shoichi Suto
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Fabrication method of single-mode optical fiber preforms
- Patent number 4,345,928
- Issue date Aug 24, 1982
- Nippon Telegraph & Telephone Public Corporation
- Masao Kawachi
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Single-mode optical fiber
- Patent number 4,306,767
- Issue date Dec 22, 1981
- Nippon Telegraph & Telephone Public Corporation
- Masao Kawachi
- G02 - OPTICS

Masao Kawachi

Person

Patents Grantslast 30 patents

Optical wavelength division multiplexing transmission network syste...

Optical signal processor, method of its control, method of its desi...

Integrated optical waveguide circuit and optical branch line test s...

Compact optical switching module including thin-film heaters and tr...

Arrayed-wave guide grating multi/demultiplexer with loop-back optic...

Waveguide-type optical matrix switch

Automated optical main distributing frame system

Guided-wave optical branching device

Guided-wave optical circuit and method for adjusting a characterist...

Guided-wave optical branching components and optical switches

Integrated optical device and method for manufacturing thereof

Integrated optical device and method for manufacturing thereof

Method for making single-polorization, single mode optical fibers

Single mode channel optical waveguide with a stress-induced birefri...

Hybrid optical integrated circuit

Method for fabricating hybrid optical integrated circuit

Core torch for fabricating single-mode optical fiber preforms

Method of fabricating multi-mode optical fiber preforms

Fabrication method of single-mode optical fiber preforms

Single-mode optical fiber