| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 5 | |
| #2 | Germany | 3 | |
| #3 | United Kingdom | 3 | |
| #4 | Switzerland | 1 | |
| #5 | France | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Presses |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kitazawa Kazuo | 12 |
| #2 | Yamanouchi Akira | 1 |
| #3 | Kazuo Kitazawa | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1008438A | Ball valve | |
| CA1005422A | Valve shaft actuation device | |
| DE2363499A1 | Operating arrangement for valve shaft - has two opposed movement hydraulic cylinders traversing guides | |
| GB1180305A | Improvements in and relating to Butterfly Valves | |
| GB1179590A | Improvements in or relating to Butterfly Valves | |
| GB1152146A | Improvements in or relating to Butterfly Valves | |
| CA864368A | Butterfly valve | |
| CA831389A | Butterfly valve | |
| CA854042A | Butterfly valve |