Average Co-Inventor Count = 3.83
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. Yamaha Hatsudoki Kabushiki Kaisha (3 from 4,237 patents)
3 patents:
1. D692797 - Helicopter
2. D478043 - Engine generator
3. D477569 - Portable engine generator