Average Co-Inventor Count = 1.69
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 (11 from 5,450 patents)
11 patents:
1. 8148623 - Apparatus for assisting in playing musical instrument
2. 7858871 - Playing device
3. 7671260 - Component of musical instrument, musical instrument and production method of the same
4. 7642439 - Electronic drum and its drum head
5. 7605324 - Apparatus for assisting in playing musical instrument
6. 7554028 - Performance assist apparatus of wind instrument
7. 6667429 - Method for manufacturing modified wood
8. 5587544 - Drum
9. 5410937 - Supporting mechanism for a sound generator of a musical instrument
10. D350362 - Musical drum rim
11. 4858510 - Resonant musical instruments