Average Co-Inventor Count = 1.00
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. Nippon Gakki Seizo Kabushiki Kaisha (3 from 841 patents)
2. Yamaha Corporation (1 from 5,454 patents)
4 patents:
1. D349719 - Electronic controller unit for a piano
2. D311412 - Combined grand piano keyboard cover and auto-play control unit
3. D278153 - Piano player
4. D256130 - Electric piano, or the like