| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 15 | |
| #2 | Canada | 5 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Engines, pumps and turbines | |
| #4 | Transport | |
| #5 | Medical technology | |
| #6 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Gearing | |
| #3 | Clutches and brakes | |
| #4 | Crop agriculture | |
| #5 | Gas-turbine plants | |
| #6 | Syringes | |
| #7 | Marine propulsion | |
| #8 | Internal-combustion piston engines | |
| #9 | Vehicle wheels |
| # | Name | Total Patents |
|---|---|---|
| #1 | Lewis Frank M | 20 |
| #2 | Nelson Clarence R | 1 |
| #3 | Lewis Alfred M | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2849995A | Free piston machine operation | |
| US2555044A | Differential mechanism | |
| US2395888A | Shaft restraining device | |
| US2397673A | Dual wheel drive mechanism | |
| US2401488A | Motor vehicle wheel mechanism | |
| US1659402A | Clutch mechanism | |
| US1704861A | Differential mechanism | |
| US1619141A | Differential mechanism | |
| US1477137A | Differential mechanism | |
| US1430744A | Differential mechanism | |
| CA190936A | Differential mechanism | |
| US1286362A | Differential mechanism. | |
| CA167490A | Vehicle wheel | |
| US1328440A | Differential mechanism | |
| CA477562A | Differential mechanism | |
| US1091580A | Differential mechanism. | |
| US1292818A | Differential mechanism. | |
| CA273975A | Clutch mechanism | |
| CA281750A | Differential mechanism |