| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 9 | |
| #2 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Machine tools | |
| #3 | Transport | |
| #4 | Materials and metallurgy | |
| #5 | Civil engineering | |
| #6 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Metal-working | |
| #3 | Railway bodies | |
| #4 | Metal tempering | |
| #5 | General building constructions | |
| #6 | Pistons and sealings | |
| #7 | Unspecified technologies | |
| #8 | Sawing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Marshall Lewis C | 11 |
| Publication | Filing date | Title |
|---|---|---|
| US2453330A | Method of making split piston rings | |
| US1758575A | Process of making piston rings | |
| US1783047A | Method of making steel piston rings | |
| US1762556A | Process and apparatus for making piston rings | |
| US1699980A | Apparatus for slitting piston rings | |
| US1965294A | Piston ring | |
| US684281A | Car-roof construction. | |
| US678189A | Car-roof construction. | |
| US673646A | Car-roof construction. | |
| CA243436A | Means for handling multiple part piston rings | |
| CA221587A | Piston ring |