Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6390233 | Method for a lifting apparatus with floating lift cylinder attachment | — | 2002-05-21 |
| 6267200 | Lift apparatus with floating lift cylinder attachment | — | 2001-07-31 |
| 6161638 | Work transfer lock system and method thereof | — | 2000-12-19 |
| 6116140 | Telescoping system with multi-stage telescopic cylinder | Claude R. Zimmerman | 2000-09-12 |
| 6029559 | Telescoping system with multiple single-stage telescopic cylinders | Claude R. Zimmerman | 2000-02-29 |
| 5927520 | Electro-hydraulic operating system for extensible boom crane | William E. Hull, Claude R. Zimmerman | 1999-07-27 |
| 5911239 | Metering valve | William E. Hull, Claude R. Zimmerman | 1999-06-15 |
| 5704498 | Transportable crane | John Smith, Ramesh Patel | 1998-01-06 |
| 5111945 | Boom extension alignment device | William E. Hull | 1992-05-12 |