Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8079782 | Semi-extensible steel soil reinforcements for mechanically stabilized embankments | William K. Hilfiker, Harold K. Hilfiker | 2011-12-20 |
| RE42680 | Compressible welded wire wall for retaining earthen formations | Harold K. Hilfiker | 2011-09-06 |