| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Materials and metallurgy | |
| #3 | Machine tools | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Special machines | |
| #2 | Cylinders for combustion engines | |
| #3 | Casting metal | |
| #4 | Clutches and brakes | |
| #5 | Grinding or polishing devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Venner William M | 11 |
| #2 | Bowser Jr Percy L | 8 |
| #3 | Bowser Percy L | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US2676372A | Piston molding core | |
| US2643742A | Brake plate and cylinder assembly | |
| US2588898A | Apparatus for molding pistons | |
| US2676371A | Piston molding core | |
| US2465766A | Piston | |
| US2643921A | Trunk piston | |
| US2465767A | Piston | |
| US2576655A | Piston | |
| US2529433A | Machine for finishing pistons | |
| US2513437A | Piston | |
| US2497380A | Piston |