| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 8 | |
| #2 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Pistons and sealings | |
| #2 | Unspecified technologies | |
| #3 | Cyclically operating valves | |
| #4 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Skinner Ralph L | 5 |
| #2 | Walter Kasten | 4 |
| #3 | Kasten Walter | 2 |
| #4 | Ernest Hanshaw | 1 |
| #5 | Kellogg Warren C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2784707A | Hydraulic valve lifter for automotive vehicles | |
| US2750212A | Plastic seal | |
| US2459654A | Reed seal for rotating equipment | |
| US2445580A | Expansion joint | |
| US2481121A | Pressure seal | |
| US2459652A | Pressure seal | |
| US2509151A | Pressure-sealing means | |
| US2404664A | Pressure sealing means | |
| CA456049A | Pressure seal | |
| CA456048A | Pressure-sealing means | |
| CA430181A | Pressure sealing means | |
| CA456050A | Pressure seal |