Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8881404 | Method of manufacturing a seamless metal clad polystyrene door | William D. Johnson | 2014-11-11 |
| 7971394 | Adjustable lock height door | William D. Johnson | 2011-07-05 |
| 7698796 | Method of replacing a door closure | William D. Johnson | 2010-04-20 |