Issued Patents 2003
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6655697 | Piston oil ring having land flanked by concave sidewalls | William E. Spengler | 2003-12-02 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6655697 | Piston oil ring having land flanked by concave sidewalls | William E. Spengler | 2003-12-02 |