Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875517 | Method of producing salt cores for use in die casting | Raymond J. Donahue, Frederick M. Hauenstein, Daniel H. Marcellis | 1989-10-24 |
| 4875985 | Method and appparatus for producing titanium | Raymond J. Donahue, William G. Hesterberg | 1989-10-24 |
| 4858671 | Method and apparatus for accelerating metal solidification | William G. Hesterberg | 1989-08-22 |
| 4830085 | Vacuum lift foam filled casting system | Raymond J. Donahue, William G. Hesterberg, Lawrence I. Toriello | 1989-05-16 |