Average Co-Inventor Count = 2.79
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 58,129 patents)
4 patents:
1. D310081 - Headphone
2. D306834 - Digital position readout system
3. 4445150 - Recording in a single track visual signals associated with audio signals
4. 4041401 - Channel indicating apparatus