| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 6 | |
| #2 | Canada | 5 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Environmental technology | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Cyclically operating valves | |
| #2 | Supplying combustion engines | |
| #3 | Unspecified technologies | |
| #4 | Gas-flow silencers for machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Estep Adrian C | 11 |
| Publication | Filing date | Title |
|---|---|---|
| US1698842A | Muffler | |
| US1752790A | Valve cage | |
| US1814622A | Valve actuating and controlling mechanism | |
| US1787975A | Fuel-injection valve | |
| US1885338A | Fuel relief valve | |
| US1814676A | Internal combustion engine | |
| CA283170A | Injector valve | |
| CA284322A | Valve mechanism | |
| CA281372A | Engine starter | |
| CA270901A | Fuel relief valve | |
| CA273584A | Valve cage |