Average Co-Inventor Count = 1.25
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 (5 from 58,132 patents)
5 patents:
1. D366874 - Combined tape recorder, clock and radio receiver
2. D351595 - Digital audio disc recorder combined with a radio tuner
3. D342948 - Combined speaker box and amplifier
4. D342254 - Radio Tuner
5. D336294 - Tape player