Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883294 | Tamper-proof locking device | — | 1989-11-28 |
| 4846080 | Apparatus for regulating air flow through an air port of a chemical recovery furnace | Thomas William Ross, Jr., Robert B. Hill | 1989-07-11 |
| 4838182 | Apparatus for regulating air flow through an air port of a chemical recovery furnace | — | 1989-06-13 |
| 4822428 | Apparatus for cleaning air ports of a chemical recovery furnace | — | 1989-04-18 |