Average Co-Inventor Count = 2.40
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. Yamaha Marine Kabushiki Kaisha (2 from 279 patents)
2. Yamaha Motor Power Products Kabushiki Kaisha (2 from 36 patents)
4 patents:
1. D594819 - Portable generator
2. D572658 - Engine generator
3. D543215 - Outboard motor
4. D542809 - Fuel tank of outboard motor