Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876947 | Pistons with bearing lands | — | 1989-10-31 |
| 4838149 | Pistons | Geoffrey M. Donnison, Robert A. Wordsworth | 1989-06-13 |
| 4817505 | Piston with stiffening structure for lower skirt regions | — | 1989-04-04 |
| 4809591 | Pistons with oil retaining depressions | David A. Parker | 1989-03-07 |