| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 6 | |
| #2 | Denmark | 5 | |
| #3 | United States | 2 | |
| #4 | Finland | 1 | |
| #5 | Ireland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Basic materials chemistry |
| # | Technology | |
|---|---|---|
| #1 | Writing or drawing tools | |
| #2 | Goods for writing upon | |
| #3 | Coating compositions |
| # | Name | Total Patents |
|---|---|---|
| #1 | Vojtech Votruba | 2 |
| #2 | Vojteck Votruba | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB642619A | Process for the manufacture of pencil leads | |
| GB638116A | Improvements in propelling pencils | |
| US2515917A | Propelling magazine pencil | |
| IE18071L | Magazine pencil. | |
| GB614073A | Improvements in pencil sharpeners | |
| GB628558A | Improvements in multi-colour magazine pencils | |
| GB630852A | Improvements in propelling magazine pencils |