Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4320605 | Insulation panel | Denny L. Carlson, Lee W. Vriezelaar | 1982-03-23 |
| 4288951 | Auxiliary insulated roof system | Denny L. Carlson, Lee W. Vriezelaar | 1981-09-15 |
| 4234007 | Automatic liquid flow control device | Joseph R. Titone, Denny L. Carlson | 1980-11-18 |