| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 2 | |
| #2 | Argentina | 1 | |
| #3 | Brazil | 1 | |
| #4 | Germany | 1 | |
| #5 | Spain | 1 | |
| #6 | France | 1 | |
| #7 | United Kingdom | 1 | |
| #8 | Ireland | 1 | |
| #9 | Japan | 1 | |
| #10 | New Zealand | 1 | |
| #11 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Paton George | 4 |
| #2 | Paton G | 2 |
| #3 | Jiyooji Peiton | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1124615A | Check valve | |
| IE791401L | Check valve with pivoting flap members | |
| NZ191156A | Double flap spring balanced check valve |