Average Co-Inventor Count = 4.56
ph-index = 3
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.
Company Filing History:
1. Tohoku Electric Power Company, Inc. (3 from 66 patents)
2. Zaidan Hojin Handotai Kenkyu Shinkokai (2 from 81 patents)
3. Tsuken Electric Ind. Co., Ltd. (1 from 1 patent)
3 patents:
1. 6137391 - Flux-controlled type variable transformer
2. 5021936 - PWM power converter using mixed bipolar and static induction transistors
3. 4719551 - Optically controlled power converting apparatus