Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8939300 | Friction/elastomeric draft gear | Donald E. Wilt, Keith A. Salis, Rosie Galindo, Robert J. Pokorski, Kris C. Jurasek | 2015-01-27 |
| RE44177 | Railroad car energy absorption apparatus | Michael D. VanMaldegiam, Erik Jensen, Donald E. Wilt, Michael S. Dillon | 2013-04-30 |
| 8201504 | Railcar constant contact side bearing assembly | Erik Jensen, Paul B. Aspengren, Michael D. VanMaldegiam, Paul A. Perlongo, Mark W. Stanek +1 more | 2012-06-19 |
| 8056486 | Railroad hopper car hatch cover | Bradley J. Haymond | 2011-11-15 |
| 7784410 | Constant contact side bearing assembly for a railcar | Paul B. Aspengren | 2010-08-31 |
| 7325499 | Constant contact side bearing assembly for a railcar | Erik Jensen, Paul B. Aspengren | 2008-02-05 |
| 7275487 | Constant contact side bearing assembly for a railcar | Paul B. Aspengren | 2007-10-02 |
| 7152534 | Constant contact side bearing assembly for a railcar | Paul B. Aspengren | 2006-12-26 |
| D529828 | Measuring tool | Paul B. Aspengren, Michael S. Dillon, Joseph M. Ingraham, Raymond E. DeGraw | 2006-10-10 |
| 7044061 | Railroad car energy absorption apparatus | Michael D. VanMaldegiam, Erik Jensen, Donald E. Wilt, Michael S. Dillon | 2006-05-16 |
| 6957611 | Constant contact side bearing assembly for a railcar | Paul B. Aspengren | 2005-10-25 |
| 6862999 | Railroad car energy absorption apparatus | Michael D. VanMaldegiam, Erik Jensen, Donald E. Wilt, Michael S. Dillon | 2005-03-08 |
| 6792871 | Railroad car energy absorption apparatus | Michael D. VanMaldegiam, Erik Jensen, Donald E. Wilt, Michael S. Dillon | 2004-09-21 |
| 6341422 | Method of manufacturing a railroad car apparatus | — | 2002-01-29 |
| 6141853 | Method of manufacturing and energy absorption apparatus for a railroad car | — | 2000-11-07 |
| 6092470 | Railroad car side bearing with thermal insulator | — | 2000-07-25 |
| 4892170 | Portable ladder assembly | — | 1990-01-09 |
| 4702645 | Slipline adjustable manhole seal | Harry W. Skinner, James W. Skinner, William O. Skinner | 1987-10-27 |
| 4619555 | Slipline adjustable manhole seal | Harry W. Skinner, James W. Skinner, William O. Skinner | 1986-10-28 |