Average Co-Inventor Count = 2.00
ph-index = 4
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 58,131 patents)
4 patents:
1. D340033 - Radio receiver of headphone type
2. D320792 - Tape player
3. D319229 - Television receiver
4. D316093 - Combined tape recorder and radio receiver