Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5356446 | Low density insulating and fire-resistant perlite concrete | David A. Smetana, Richard J. Lenczewski, Said Dimitry | 1994-10-18 |
| 5302200 | Hydrating and plasticizing admixture for dense concrete | David A. Smetana, Richard J. Lenczewski | 1994-04-12 |
| 5294255 | Pumpable backfill grout | David A. Smetana, Richard J. Lenczewski | 1994-03-15 |
| 5193941 | Grout and method of distributing aluminum therein | — | 1993-03-16 |
| 5118527 | Dry grout and method of distribution aluminum therein | — | 1992-06-02 |