Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8387753 | Ergonomic extendable/retractable ladder | Mitchell I. Kieffer, Bruce A. Hillukka, Michael J. Kelly, Wayne A. Shakal | 2013-03-05 |
| D593685 | Telescoping ladder rung | Mitchell I. Kieffer, Bruce A. Hillukka, Micheal J. Kelly, Wayne A. Shakal | 2009-06-02 |
| 7048094 | Extending ladder and associated manufacturing methods | Mitchell I. Kieffer, Wang Kuo Hua | 2006-05-23 |
| 6883645 | Extending ladder and associated manufacturing methods | Mitchell I. Kieffer, Wang Kuo Hua | 2005-04-26 |
| 6708800 | Extending ladder and associated manufacturing methods | Mitchell I. Kieffer, Wang Kuo Hua | 2004-03-23 |