Average Co-Inventor Count = 3.00
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.
3 patents:
1. D972997 - Muffler for motorcycles
2. D972477 - Resonance chamber part of an exhaust pipe
3. D966974 - Resonance chamber part of an exhaust pipe