Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE39504 | Counterbalance system for upward acting door | Leroy G. Krupke, Richard K. Hoofard, D. Scott Boucher | 2007-03-13 |
| 6263541 | Winding cone of an overhead door counterbalancing mechanism and torsion spring winding method therefor | — | 2001-07-24 |
| 6134835 | Counterbalance system for upward acting door | Leroy G. Krupke, D. Scott Boucher, Richard K. Hoofard | 2000-10-24 |
| 5913352 | Hinge and improved hinge and panel surface geometry of a multi-panel door assembly | Gregory D. Robertson, Bruce N. Bates | 1999-06-22 |