Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6905104 | Patient or visitor sign-in device | Keith L. Offenhauer | 2005-06-14 |
| 6580362 | Aural warning system for buses | C. Jay Zimmerman | 2003-06-17 |
| 4876798 | Level with illuminated bubble vials | — | 1989-10-31 |