Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882831 | Method of producing aircraft plate and sheet | Ho Yu, Robert A. Ramser | 1989-11-28 |
| 4869870 | Aluminum-lithium alloys with hafnium | Roberto J. Rioja, Philip E. Bretz | 1989-09-26 |
| 4832910 | Aluminum-lithium alloys | Roberto J. Rioja, Philip E. Bretz | 1989-05-23 |