Average Co-Inventor Count = 3.00
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. Tokyo Shibaura Denki Kabushiki Kaisha (4 from 2,916 patents)
4 patents:
1. 4646187 - Cassette tape recorder
2. 4625251 - Tape recorder
3. 4562497 - Tape drive spindle
4. 4542430 - Tape recorder