Growing community of inventors

Fukuoka, Japan

Keiko Sonoda

Average Co-Inventor Count = 2.00

ph-index = 1

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 = 1

Keiko SonodaToshiaki Sakiyama (1 patent)Keiko SonodaKeiko Sonoda (1 patent)Toshiaki SakiyamaToshiaki Sakiyama (2 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Matsushita Electric Industrial Co., Ltd. (1 from 27,375 patents)


1 patent:

1. 5519765 - Telephone answering machine

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as of
12/18/2025
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