Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7897102 | Method of making valve guide by powder metallurgy process | Howard Livingston | 2011-03-01 |
| 7628870 | Heat treated valve guide and method of making | Howard Livingston | 2009-12-08 |