| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 12 | |
| #2 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Unspecified technologies | |
| #3 | Servomotors | |
| #4 | Cyclically operating valves | |
| #5 | Unspecified technologies | |
| #6 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Gardner Lawrence H | 24 |
| Publication | Filing date | Title |
|---|---|---|
| US3145967A | Elastic sleeve valve | |
| US3038487A | Shuttle valve | |
| US2996080A | Manifold valve assembly | |
| US2983285A | Solenoid operated valve | |
| US2955539A | Positive displacement pump | |
| US2948298A | Valve | |
| US2711757A | Valve | |
| US2591801A | Valve structure | |
| US2674266A | Supply and exhaust valve for servomotors | |
| US2543010A | Valve | |
| US2606739A | Fluid control valve | |
| US2634947A | Flow control valve | |
| CA535718A | Valve | |
| CA487889A | Fluid control valve | |
| CA617065A | Manifold valve assembly | |
| CA484607A | Valve | |
| CA683621A | Positive displacement pump | |
| CA632450A | Solenoid operated valve | |
| CA676980A | Valve | |
| CA645265A | Valve structure |