| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | United Kingdom | 4 | |
| #3 | France | 2 | |
| #4 | Switzerland | 1 | |
| #5 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Machines | |
| #3 | Textiles and paper |
| # | Technology | |
|---|---|---|
| #1 | Writing or drawing tools | |
| #2 | Unspecified technologies | |
| #3 | Printing processes | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hajime Ishida | 4 |
| #2 | Seikichi Yanagita | 2 |
| #3 | Natsuki Wada | 1 |
| #4 | Ikeda Yasuo | 1 |
| #5 | Ichiro Takahashi | 1 |
| #6 | Uchida Ryujiro | 1 |
| #7 | Ryujiro Uchida | 1 |
| #8 | Yasuo Ikeda | 1 |
| #9 | Chuji Kurihara | 1 |
| #10 | Yanagita Seikichi | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3175261A | Clip mounting device for writing tools | |
| US3292596A | Nib unit fixing device for writing pens | |
| US3203403A | Fountain pen | |
| GB1003302A | Improvements in or relating to pressure-sensitive copying material | |
| GB896958A | Improvements in or relating to fountain pens | |
| US2871825A | Fountain pen |