Average Co-Inventor Count = 2.93
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 (4 from 58,132 patents)
4 patents:
1. D247794 - Tape cassette case
2. 4067629 - Storage receptacle for magnetic tape cassette
3. 4055372 - Storage receptacle for magnetic tape cassette
4. 4054344 - Storage receptacle for magnetic tape cassette