Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5515807 | One-way roadway marker | Peter A. Speer, Harry J. Glutting | 1996-05-14 |
| 5392728 | Roadway markers with concave curved edges | Peter A. Speer, Harry J. Glutting | 1995-02-28 |
| 5327850 | Roadway marker | Peter A. Speer, Harry J. Glutting | 1994-07-12 |