Growing community of inventors

Fukuoka, Japan

Shigeharu Sayama

Average Co-Inventor Count = 2.80

ph-index = 6

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 257

Shigeharu SayamaTetsuya Tanaka (5 patents)Shigeharu SayamaHiroshi Koizumi (5 patents)Shigeharu SayamaYoshikazu Ishitsuka (4 patents)Shigeharu SayamaRyosuke Miyagawa (4 patents)Shigeharu SayamaTadasu Nagao (1 patent)Shigeharu SayamaRyosuke Miyakawa (1 patent)Shigeharu SayamaYoshikazu Ishizuka (1 patent)Shigeharu SayamaShigeharu Sayama (7 patents)Tetsuya TanakaTetsuya Tanaka (98 patents)Hiroshi KoizumiHiroshi Koizumi (59 patents)Yoshikazu IshitsukaYoshikazu Ishitsuka (8 patents)Ryosuke MiyagawaRyosuke Miyagawa (6 patents)Tadasu NagaoTadasu Nagao (2 patents)Ryosuke MiyakawaRyosuke Miyakawa (1 patent)Yoshikazu IshizukaYoshikazu Ishizuka (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Hitachi, Ltd. (5 from 42,517 patents)

2. Kyushu Hitachi Maxell, Ltd. (2 from 37 patents)


7 patents:

1. D625407 - Automatic urine accumulator

2. 7722584 - Automatic urine collection apparatus

3. 7438706 - Automatic urine collecting apparatus

4. D564655 - Automatic urine accumulator

5. D536782 - Automatic urine accumulator

6. 4714200 - Nozzle for sprayer

7. 4618099 - Electric spray

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as of
1/7/2026
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