Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8640895 | Drum tensioning method and apparatus for load hoist wire rope | Terry S. Casavant, Paul M. Pukita | 2014-02-04 |
| 8608134 | Crane hook block | Lambert Drent, Dirk Albert Stamhuis, William J. O'Neil | 2013-12-17 |
| 8573419 | Swing drive system for cranes | Joseph R. Kaiser, Andrew L. Langer | 2013-11-05 |
| 7967158 | Mobile lift crane with variable position counterweight | David J. Pech, Kenneth J. Porubcansky, John M. Lanning | 2011-06-28 |
| 7946560 | Crane hook block | Lambert Drent, Dirk Albert Stamhuis, William J. O'Neil | 2011-05-24 |
| 6588521 | Four track crawler crane | Kenneth J. Porubcansky, David J. Pech | 2003-07-08 |
| 6131751 | Counter weight handling system and boom parking device | David J. Pech, Kenneth J. Porubcansky | 2000-10-17 |