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last 30 patents
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Patent Grant
Process for making TiC-base/SiC whisker composite ceramic cutting t...
Patent number
5,601,764
Issue date
Feb 11, 1997
NGK Spark Plug Co., Ltd.
Junichiro Suzuki
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
TiC-base/SiC whisker composite ceramic cutting tools
Patent number
5,439,854
Issue date
Aug 8, 1995
NGK Spark Plug Co., Ltd.
Junichiro Suzuki
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Process for producing aluminum nitride sintered body with high ther...
Patent number
4,997,798
Issue date
Mar 5, 1991
NGK Spark Plug Co., Ltd.
Akiyasu Okuno
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Aluminum nitride sintered body with high thermal conductivity and p...
Patent number
4,961,987
Issue date
Oct 9, 1990
NGK Spark Plug Co., Ltd.
Akiyasu Okuno
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Whisker-reinforced ceramics
Patent number
4,956,317
Issue date
Sep 11, 1990
NGK Spark Plug Co., Ltd.
Hitoshi Yokoi
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Composite ceramic material reinforced with silicon carbide whiskers
Patent number
4,946,807
Issue date
Aug 7, 1990
NGK Spark Plug Co., Ltd.
Akiyasu Okuno
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Surface structure of A1N substrate and a process for producing the...
Patent number
4,892,703
Issue date
Jan 9, 1990
NGK Spark Plug Co., Ltd.
Satoshi Iio
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Aluminum nitride sintered body with high thermal conductivity and p...
Patent number
4,877,760
Issue date
Oct 31, 1989
NGK Spark Plug Co., Ltd.
Akiyasu Okuno
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Surface structure of AlN substrate and a process for producing the...
Patent number
4,840,853
Issue date
Jun 20, 1989
NGK Spark Plug Co., Ltd.
Satoshi Iio
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Composite layer aluminum nitride base sintered body
Patent number
4,800,137
Issue date
Jan 24, 1989
NGK Spark Plug Co., Ltd.
Akiyasu Okuno
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Dense silicon carbide microwave absorber for electron linear accele...
Patent number
4,760,312
Issue date
Jul 26, 1988
NGK Spark Plug Co., Ltd.
Masakazu Watanabe
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Silicon carbide-graphite composite material
Patent number
4,701,426
Issue date
Oct 20, 1987
NGK Spark Plug Co., Ltd.
Akiyasu Okuno
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Composite layer aluminum nitride base sintered body
Patent number
4,695,517
Issue date
Sep 22, 1987
NGK Spark Plug Co., Ltd.
Akiyasu Okuno
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Silicon carbide-graphite composite material and process for produci...
Patent number
4,690,909
Issue date
Sep 1, 1987
NGK Spark Plug Co., Ltd
Akiyasu Okuno
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Process for producing silicon carbide heating elements
Patent number
4,668,452
Issue date
May 26, 1987
NGK Spark Plug Co., Ltd.
Masakazu Watanabe
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Microwave absorber comprised of a dense silicon carbide body which...
Patent number
4,638,268
Issue date
Jan 20, 1987
NGK Spark Plug Co., Ltd.
Masakazu Watanabe
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Sintered cubic boron nitride and process for producing the same
Patent number
4,375,517
Issue date
Mar 1, 1983
NGK Spark Plug Co., Ltd.
Masakazu Watanabe
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information
Patent Grant
Process for producing silicon carbide heating elements
Patent number
4,336,216
Issue date
Jun 22, 1982
NGK Spark Plug Co., Ltd.
Masakazu Watanabe
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES