| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Machines | |
| #3 | Control | |
| #4 | Thermal processes | |
| #5 | Mechanical elements |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hopkins Frank H | 3 |
| #2 | August Ileman Emil | 2 |
| #3 | Herbert Milker | 2 |
| #4 | Eugen Blum | 2 |
| #5 | Hugo Froehlich | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1648124A | Spring seat for spring-loaded valves | |
| US1630755A | Temperature-control system | |
| US1605113A | Regulating valve | |
| US1572900A | Automatic control system | |
| US1538558A | Regulating valve | |
| DE434274C | Device on recording apparatus for applying characters to a recording sheet enclosed in a housing | |
| US1660382A | Compound relief valve | |
| US1484068A | Pressure gauge | |
| US1658840A | Gauge construction | |
| US1488904A | Gauge | |
| US1639978A | Tachometer |