| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Canada | 1 | |
| #3 | Germany | 1 | |
| #4 | France | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | Ireland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Internal-combustion piston engines | |
| #2 | Machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Harper Jr William | 7 |
| #2 | Kerekes Emery B | 1 |
| #3 | Harper William Jr | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1909271A | Mechanical movement | |
| IE12667L | Internal combustion engines | |
| GB366237A | Improvements in revolving cylinder internal-combustion engines | |
| US1912638A | Combustion engine | |
| US1776504A | Valve | |
| US1722260A | Combustion engine and method of operating same | |
| US1722259A | Internal-combustion engine | |
| US1722258A | Combustion engine | |
| US1722257A | Rotary reciprocating combustion engine | |
| CA338140A | Combustion engine |