| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 4 | |
| #2 | China | 3 | |
| #3 | United States | 3 | |
| #4 | WIPO (World Intellectual Property Organization) | 3 | |
| #5 | EPO (European Patent Office) | 2 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Measurement | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Special musical instruments | |
| #2 | Electrophonic musical instruments | |
| #3 | Shafts | |
| #4 | Special measuring | |
| #5 | Measuring length, angles and areas |
| # | Name | Total Patents |
|---|---|---|
| #1 | Katayama Ichiro | 14 |
| #2 | Katayama Masaya | 1 |
| #3 | Yang Lingli | 1 |
| #4 | Ichiro Katayama | 1 |
| Publication | Filing date | Title |
|---|---|---|
| JP2020018259A | Gray hair or vitiligo model non-human animal | |
| CN108140372A | Sound pick-up and the stringed musical instrument with sound pick-up | |
| WO2016035143A1 | Pickup unit for string instrument | |
| JP2012238021A | Guitar | |
| JP2011013516A | Guitar | |
| JP2010204400A | Capotasto | |
| US4563045A | Bearing unit for sliding device | |
| EP0107338A2 | Displaying device for dial gauge |