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Yokohama, Japan

Keiji Hatakeyama

USPTO Granted Patents = 4

Average Co-Inventor Count = 4.1

ph-index = 4

Forward Citations = 40(Granted Patents)

Location History:

Yokohama, JP (1987 - 1993)
Kanagawa-ken, JP (1998)

Company Filing History:

Toshiba Lighting & Technology Corporation

2 out of 52,735

Kabushiki Kaisha Toshiba

Sumitomo Cement Co., Ltd.

where one patent can have more than one assignee

Years Active: 1987-1998

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4 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5801483 - Fluorescent lamp having visible and UV radiation (1998-09-01),

2. 5227693 - Fluorescent lamp with UV suppressing film and its manufacturing method (1993-07-13),

3. 5051650 - Ultraviolet-suppressed light source, coating agent used in the same, and (1991-09-24),

4. 4663563 - Halophosphate phosphor and fluorescent lamp using the same (1987-05-05),

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