Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5472484 | Oil-spill marking composition | — | 1995-12-05 |
| 5356465 | Oil-spill marking method and composition | — | 1994-10-18 |
| 5293721 | Horizontal cable animal barrier | James T. Richard, George Costigan, David Perry | 1994-03-15 |