Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818202 | Hydration means | Douglas Hacking | 1989-04-04 |
| 4812273 | Moulding of construction products by vibration and pressure applications at relatively small intensities | — | 1989-03-14 |