Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5277513 | Snowplowable pavement marker using different materials | Robert M. Flanagan, Sidney A. Heenan, Richard M. Steere | 1994-01-11 |
| 4729690 | Self-righting highway marker support and method for installing same | Michael R. Lavender, Sidney A. Heenan | 1988-03-08 |