Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5515807 | One-way roadway marker | Peter A. Speer, Michael W. Sly | 1996-05-14 |
| 5460115 | Temporary roadway marker | Peter A. Speer | 1995-10-24 |
| 5392728 | Roadway markers with concave curved edges | Peter A. Speer, Michael W. Sly | 1995-02-28 |
| 5327850 | Roadway marker | Michael W. Sly, Peter A. Speer | 1994-07-12 |