| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 14 | |
| #2 | Canada | 5 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Measurement | |
| #4 | Medical technology |
| # | Technology | |
|---|---|---|
| #1 | Pistons and sealings | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Measuring length, angles and areas | |
| #5 | Nails | |
| #6 | Diagnosis and surgery |
| # | Name | Total Patents |
|---|---|---|
| #1 | Johnston Charles F | 19 |
| #2 | Rees George G | 2 |
| #3 | Martinelli Lloyd A | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4690171A | Valve assembly for a sphygmomanometer | |
| US2578555A | Piston expander | |
| US2350619A | Piston expander and stabilizer | |
| US2260031A | Piston ring | |
| US2245980A | Piston ring | |
| US2170970A | Piston, ring, and ring expander | |
| US2203154A | Piston ring | |
| US2140133A | Piston expander | |
| US2150062A | Piston expander | |
| US2010518A | Piston expander | |
| US1649474A | Piston ring | |
| US1448222A | Circular micrometer | |
| US1411360A | Piston ring | |
| US1384019A | Combined washer and lock-nut | |
| CA137714A | Spark plug | |
| CA391316A | Piston ring | |
| CA376495A | Piston expander | |
| CA361764A | Piston expander | |
| CA376799A | Piston expander |