| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Machines | |
| #3 | Control | |
| #4 | Electrical machinery and energy | |
| #5 | Packaging and shipping | |
| #6 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Measuring distances | |
| #2 | Unspecified technologies | |
| #3 | Mechanically-driven clocks | |
| #4 | Teaching materials | |
| #5 | Handling thin material | |
| #6 | Resistors | |
| #7 | Earth drilling | |
| #8 | Systems controlling non-electric variables |
| # | Name | Total Patents |
|---|---|---|
| #1 | Colvin Charles H | 14 |
| #2 | Delaney Louis A | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3071189A | Oil well pumping unit and method of using same | |
| US2617912A | Potentiometer | |
| US2092389A | Flyer | |
| US2048920A | Magnetic compensator | |
| US2116508A | Aircraft navigating instrument | |
| US2005935A | Means for intercommunication | |
| US1572884A | Stop watch and dial | |
| US1660152A | Turn indicator | |
| US1610931A | Compass | |
| US1334273A | Magnetic compass | |
| US1610930A | Instrument for indicating angular motion | |
| US1667840A | Instrument for indicating direction of forces | |
| US1592081A | Directional stabilizer | |
| CA208457A | Compass |