| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 6 | |
| #2 | Canada | 5 | |
| #3 | Denmark | 5 | |
| #4 | Spain | 3 | |
| #5 | Austria | 2 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Cyclically operating valves | |
| #3 | Internal-combustion piston engines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wennerby Arthur Oskar Leonard | 13 |
| #2 | Oskar Leonard Wennerby Arthur | 6 |
| Publication | Filing date | Title |
|---|---|---|
| US2394128A | Gate valve | |
| CA243589A | Two-stroke cycle combustion engine | |
| CA279269A | Internal combustion engine | |
| CA235964A | Combined air valve and fuel pump for internal combustion engines | |
| CA232392A | Two or more cylinder combustion engine | |
| CA223123A | Two cylinder internal combustion engine |