Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886640 | Hot work tool steel with good temper resistance | Harrison A. Garner, Jr., Raymond M. Hemphill, John F. McGraw, Michael L. Schmidt, Bruce A. Smith | 1989-12-12 |
| 4853181 | Hot work tool steel | Raymond M. Hemphill | 1989-08-01 |