Average Co-Inventor Count = 2.25
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.
Company Filing History:
1. Tokyo Shibaura Denki Kabushiki Kaisha (3 from 2,916 patents)
3 patents:
1. 4519558 - Tape player
2. 4492995 - Tape cassette loading and ejection device
3. 4360174 - Cassette tape recorder