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Yokkaichi, Japan

Hiroshi Oka

This inventor holds 7 USPTO granted patents. Top assignees: Japan Synthetic Rubber Co., Ltd., Tanken Seal Seiko Co., Ltd.. Active years: 1981-2002.

USPTO Granted Patents = 7

% Patents Active = 100.0

Average Co-Inventor Count = 3.2

ph-index = 5

Forward Citations = 100(Granted Patents)

Location History:

Yokkaichi, JP (1984 - 1993)
Tokyo, JP (1981 - 2002)

Company Filing History:

Japan Synthetic Rubber Co., Ltd.

Tanken Seal Seiko Co., Ltd.

Years Active: 1981-2002

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7 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6460858 - Mechanical seal (2002-10-08),

2. 5202388 - Process for producing hydrogenation product of ring-opening polymer (1993-04-13),

3. 5164469 - Transparent resin material (1992-11-17),

4. 5019479 - Positive type radiation-sensitive resin composition comprising a (1991-05-28),

5. 4454310 - Polyamide acid, process for producing same and polyimide obtained (1984-06-12),

6. 4283579 - Process for producing diol (1981-08-11),

7. 4268447 - Process for producing tetrahydrofuran and 1,4-butanediol (1981-05-19),

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