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Hiroyuki Nagayama
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Fukuoka, JP
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last 30 patents
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Patent Grant
Gradient function material seal cap for discharge lamp bulb
Patent number
5,972,067
Issue date
Oct 26, 1999
Toto Ltd.
Hirotaka Ishibashi
B28 - WORKING CEMENT, CLAY, OR STONE
Information
Patent Grant
Gradient function material
Patent number
5,943,546
Issue date
Aug 24, 1999
Toto Ltd.
Hirotaka Ishibashi
B28 - WORKING CEMENT, CLAY, OR STONE
Information
Patent Grant
Sealing structure for light-emitting bulb assembly and method of ma...
Patent number
5,742,123
Issue date
Apr 21, 1998
Toto Ltd.
Hiroyuki Nagayama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Methods of manufacturing gradient function material
Patent number
5,653,924
Issue date
Aug 5, 1997
Toto Ltd.
Hirotaka Ishibashi
B28 - WORKING CEMENT, CLAY, OR STONE