Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4555880 | Adjustable base for office landscaping system | Lloyd G. Ritzema, David Kent Haadsma | 1985-12-03 |
| 4449337 | Adjustable base for office landscaping system | Lloyd G. Ritzema, David Kent Haadsma | 1984-05-22 |
| 4443986 | Panel construction system | Paul L. Propst, Ralph Murrel, Donald A. Richardson, Carl B. Hinrichs | 1984-04-24 |