| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Machine tools | |
| #4 | Materials and metallurgy | |
| #5 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Pistons and sealings | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Turning | |
| #5 | Metal-working | |
| #6 | Vehicle brake control systems | |
| #7 | Casting metal |
| # | Name | Total Patents |
|---|---|---|
| #1 | Mcfall Thurlow E | 12 |
| #2 | Warren Charles H | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2439546A | Piston ring | |
| US2405318A | Piston ring spacer | |
| US2404140A | Piston ring | |
| US2334570A | Piston ring | |
| US2220344A | Piston ring | |
| US2027606A | Trailer brake construction | |
| US1944255A | Ring holding arbor | |
| US1919239A | Knurled piston ring arbor | |
| US1906389A | Piston ring arbor | |
| US1783886A | Piston-ring casting | |
| US1749147A | Process of piston-ring casting | |
| US1624613A | Piston packing |