Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6334280 | Sound absorbing cementitious tile | Etienne Frappart, David Townsend, Utkarsha Joshi, William Bell Devereux | 2002-01-01 |
| 5634638 | Portable, retractable sports enclosure | Ronald W. Havens, Johannus J. DeGroot | 1997-06-03 |
| 4351138 | Roof construction and method thereof | Jerry L. Severson | 1982-09-28 |