Average Co-Inventor Count = 4.29
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. Sony Corporation (3 from 58,130 patents)
3 patents:
1. 4805054 - Recording and/or reproducing device for the flexible magnetic disk
2. 4437778 - Tape cassette having means for adjusting a tape segment length for a
3. 4114252 - Manufacturing apparatus for tape cassette