Average Co-Inventor Count = 3.15
ph-index = 6
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 Corporation (5 from 5,450 patents)
2. Nippon Gakki Seizo Kabushiki Kaisha (3 from 841 patents)
8 patents:
1. 5756917 - Automatic accompaniment device capable of selecting a desired
2. 5223655 - Electronic musical instrument generating chord data in response to
3. 5147969 - Musical tone control apparatus
4. 5125313 - Musical tone control apparatus
5. 5081896 - Musical tone generating apparatus
6. 4649786 - Electronic musical instrument
7. 4391176 - Electronic musical instrument with musical composition fashion selectors
8. 4356751 - Electronic musical instrument