Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5008298 | Expandable thermoplastic resin beads | Richard B. Allen, William E. Gibbs | 1991-04-16 |
| 4920153 | Expandable thermoplastic resin beads | Richard B. Allen, William E. Gibbs | 1990-04-24 |
| 4874796 | Expandable thermoplastic resin beads | Richard B. Allen, William E. Gibbs | 1989-10-17 |
| 4782098 | Expandable thermoplastic resin beads | Richard B. Allen, William E. Gibbs | 1988-11-01 |