Average Co-Inventor Count = 1.50
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 (6 from 58,129 patents)
6 patents:
1. D669880 - Portable recorder
2. D667786 - Charger for a rechargeable battery
3. D658150 - Portable recorder
4. D648340 - Storage medium
5. D642516 - Rechargeable battery
6. D569674 - Disc case