Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE31005 | Resilient plastic piston ring | Harold E. McCormick | 1982-08-03 |
| 4214762 | Rolled metal piston ring | Harold E. McCormick, William F. Ott, Donald J. Mayhew | 1980-07-29 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE31005 | Resilient plastic piston ring | Harold E. McCormick | 1982-08-03 |
| 4214762 | Rolled metal piston ring | Harold E. McCormick, William F. Ott, Donald J. Mayhew | 1980-07-29 |