Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10760337 | Ladder leveler and method | Joseph C. Dangrow, James J. Grebinoski | 2020-09-01 |
| 10072689 | Stanchion systems, stanchion attachment systems, and horizontal lifeline systems including stanchion systems | Thomas W. Parker, Eric M. Manson | 2018-09-11 |
| 9272168 | Energy absorbers, connectors and horizontal lifeline systems | Thomas W. Parker, Eric M. Manson, Preston L. Anderson | 2016-03-01 |
| 8616336 | Method for a ladder with a ladder leveler | Joseph C. Dangrow, James J. Grebinoski | 2013-12-31 |
| 8490747 | Telescoping project tray | Yick B. Shum, John J. Dylik, Marcus Burzynski | 2013-07-23 |
| 8261882 | Ladder leveler and method | Joseph C. Dangrow, James J. Grebinoski | 2012-09-11 |
| 8256573 | Ladder leveler and method | Joseph C. Dangrow, James J. Grebinoski | 2012-09-04 |
| 8104578 | Stepladder folding twin-step | Jason R. Moldthan, Thomas W. Parker, Jack Warren Gee, II, Kyle G. Astor, Timothy James Brookbank | 2012-01-31 |
| 7931123 | Stepladder folding twin-step | Jason R. Moldthan, Thomas W. Parker, Jack Warren Gee, II, Kyle G. Astor, Timothy James Brookbank | 2011-04-26 |
| 7306075 | Dynamic hinge for ladder | Joseph C. Dangrow | 2007-12-11 |
| 7165649 | Positioning system for folding ladder and method of installation of folding ladder using positioning system | Brett Latimer, Ronald K. Burig, Christine A. Brown, David E. Plotner, John Fiumefreddo +1 more | 2007-01-23 |