Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6142255 | Ladder, member for connecting a rail to a horizontal element of a ladder, and method | David E. Plotner, Edward E. Heald, Frederick J. Bartnicki, Mitchell H. Hetrich | 2000-11-07 |
| 5791439 | Ladder, member for connecting a rail to a horizontal element of a ladder, and method, and apparatus and method for holding a washer | David E. Plotner, Edward E. Heald, Kevin McIntire, Mitchell H. Hetrich, Frederick J. Bartnicki | 1998-08-11 |
| 5636706 | Ladder, member for connecting a rail to a horizontal element of a ladder, and method | David E. Plotner, Edward E. Heald, Frederick J. Bartnicki, Mitchell H. Hetrich | 1997-06-10 |
| 5154255 | Ladder shoe and method of use | Stanley A. Kiska | 1992-10-13 |
| 5020757 | Ladder jack clamping devices | Stanley A. Kiska | 1991-06-04 |