| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 13 | |
| #2 | United States | 8 | |
| #3 | Germany | 4 | |
| #4 | France | 4 | |
| #5 | United Kingdom | 4 | |
| #6 | China | 2 | |
| #7 | Italy | 1 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Writing or drawing tools |
| # | Name | Total Patents |
|---|---|---|
| #1 | Yamanaka Shizuo | 26 |
| #2 | Kaneshiro Tetsuo | 4 |
| #3 | Kinjo Tetsuo | 2 |
| Publication | Filing date | Title |
|---|---|---|
| JP2013123862A | Conical nib, and writing utensil using the same | |
| US2011274478A1 | Conical nib and writing instrument incorporating the same | |
| JPH09156279A | Pen point | |
| JPH07237385A | Conical pen point | |
| JPH071881A | Pen point structure and its manufacture | |
| US4986686A | Multiangular pen | |
| GB2247864A | Multiangular pen | |
| GB8828455D0 | Multiangular pen | |
| JPH0243099A | Polygonal pen | |
| JPH01148597A | Polygonal pen | |
| JPS63185696A | Polygonal type pen | |
| JPS63185695A | Polygonal type pen point structure | |
| JPS6052395A | Base body of pen point | |
| JPS60132799A | Base body of pen point | |
| JPS57181897A | Manufacture of combination pen point structure | |
| JPS56135098A | Structure of polygonal pen point | |
| JPS55128497A | Structure of pen point |