| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 7 | |
| #2 | Denmark | 7 | |
| #3 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Pistons and sealings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Madsen Tage | 12 |
| #2 | Tage Madsen | 6 |
| Publication | Filing date | Title |
|---|---|---|
| CA388620A | Piston ring | |
| CA310996A | Piston packing ring | |
| CA360773A | Packing ring | |
| CA445692A | Piston for internal combustion, steam and other engines |