Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4494318 | Apparatus and method for manufacturing cured resin-coated particles for use as a proppant | — | 1985-01-22 |
| 4352856 | Shaped rigid articles containing fly ash and resin | — | 1982-10-05 |
| 4310045 | Process for forming shell sand with molten phenolformaldehyde resin | — | 1982-01-12 |