Average Co-Inventor Count = 5.54
ph-index = 2
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. Kabushiki Kaisha Sankyo Seiki Seisakusho (2 from 307 patents)
2. Nippon Hoso' Kyokai (1 from 372 patents)
2 patents:
1. 5270890 - Helical scan type rotary head apparatus
2. 5206771 - Tape drive mechanism