Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4744182 | Modular building structure and method | Robert Helfman | 1988-05-17 |
| 4631893 | Single story house addition structure and method | Robert Helfman | 1986-12-30 |
| 4506892 | Ball and tube game apparatus and method | — | 1985-03-26 |
| 4480420 | Dormer structure and method | Robert Helfman | 1984-11-06 |
| 4449334 | Dormer structure and method | Robert Helfman | 1984-05-22 |
| 4364196 | Method of operating ferrous toy | — | 1982-12-21 |