Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5425596 | Pavement marker | Sidney A. Heenan | 1995-06-20 |
| 5340231 | Pavement marker | Sidney A. Heenan | 1994-08-23 |
| 5277513 | Snowplowable pavement marker using different materials | Robert M. Flanagan, Sidney A. Heenan, Henry R. Krepel | 1994-01-11 |