| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Sweden | 6 | |
| #2 | United Kingdom | 2 | |
| #3 | Canada | 1 | |
| #4 | Germany | 1 | |
| #5 | Finland | 1 | |
| #6 | Norway | 1 | |
| #7 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Finishing work on buildings | |
| #2 | Structural elements | |
| #3 | Unspecified technologies | |
| #4 | Platform constructions |
| # | Name | Total Patents |
|---|---|---|
| #1 | Helmerson P | 4 |
| #2 | Helmersson P | 2 |
| #3 | Sundqvist N | 2 |
| #4 | Sundquist N | 1 |
| #5 | Sundquist | 1 |
| #6 | Helmerson | 1 |
| #7 | Helmerson E | 1 |
| #8 | Erik Helmerson Per | 1 |
| #9 | Helmerson Per-Erik | 1 |
| #10 | Erik Sundquist Nils | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3724156A | A lining board | |
| GB1208989A | Improvements in or relating to plasterboard wall panels |