Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5277513 | Snowplowable pavement marker using different materials | Sidney A. Heenan, Henry R. Krepel, Richard M. Steere | 1994-01-11 |
| 5257875 | One-way snowplowable pavement marker | — | 1993-11-02 |
| 4854768 | Depressible roadway marker | Sidney A. Heenan | 1989-08-08 |
| 4659248 | Self cleaning pavement marker | — | 1987-04-21 |
| 4596622 | Method for making an abrasion-resistant reflective marker | Sidney A. Heenan, Ramon J. Ascencio | 1986-06-24 |
| 4498733 | Reflector structure | — | 1985-02-12 |
| D270143 | Snowplowable roadway marker | — | 1983-08-16 |
| D257586 | Highway delineator | Sidney A. Heenan | 1980-12-02 |
| 4224002 | Highway delineator | Sidney A. Heenan | 1980-09-23 |