Average Co-Inventor Count = 4.00
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 58,131 patents)
3 patents:
1. 5287240 - Tape cassette
2. 5204796 - Tape cassette with tape tension controlled by grease of a specified
3. 5097374 - Tape cassette having tapered guide pins press-fitted into cassette wall