Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5934990 | Mine stopping | John Steffenino, Timothy J. Shean, Joseph C. Zelanko | 1999-08-10 |
| 5236499 | Sprayable wall sealant | Raymond R. Chervenak, Ronald L. Paxton | 1993-08-17 |
| 5043019 | Sealant for concrete or cinder block walls | Raymond R. Chervenak, Timothy J. Shean | 1991-08-27 |