Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4570912 | Pneumatic spring counterbalance having improved damping structure | George C. Ludwig | 1986-02-18 |
| 4408751 | Multi-chamber temperature compensated pneumatic counterbalance | George C. Ludwig | 1983-10-11 |
| 4192788 | Modified polyethylene containing hot-melt adhesives useful for carpet tape | — | 1980-03-11 |