Average Co-Inventor Count = 2.00
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. Sony Corporation (2 from 58,130 patents)
2 patents:
1. 5101308 - Tape reel for magnetic tape cassette
2. 4846419 - Cassette reel having an indicator for tape volume with an upper flange