Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5322473 | Modular wall apparatus and method for its use | Joseph Hofstra, Mark Fischer | 1994-06-21 |
| 5181883 | Smoker's booth | Joseph Hofstra, Mark Fischer | 1993-01-26 |
| 5085134 | Smoker's booth | Joseph Hofstra, Mark Fischer | 1992-02-04 |