Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6681474 | Pre-plating of wooden railroad ties | David Ollendick | 2004-01-27 |
| 6561780 | System and assembly for the manufacturing of prestressed reinforced concrete railroad ties and the like | David Ollendick | 2003-05-13 |
| 6546612 | Pre-plating of wooden railroad ties | David Ollendick | 2003-04-15 |
| 6374475 | Method for manufacturing prestressed reinforced concrete railroad ties | David Ollendick | 2002-04-23 |
| 6292997 | Pre-plating of wooden railroad ties | David Ollendick | 2001-09-25 |
| 5747074 | Apparatus for the manufacturing of prestressed reinforced concrete railroad ties and the like | David Ollendick | 1998-05-05 |