Average Co-Inventor Count = 1.60
ph-index = 2
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 (2 from 58,132 patents)
2 patents:
1. 6446001 - Navigation apparatus for navigating a vehicle based on symbolic sounds
2. 6016110 - Map display device, map display method, navigation device and automobile