Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9702110 | Panel connector and method of use | William K. Hilfiker, Harold K. Hilfiker | 2017-07-11 |
| 9011048 | Method for constructing a mechanically stabilized earthen embankment using semi-extensible steel soil reinforcements | William K. Hilfiker, Harold K. Hilfiker | 2015-04-21 |
| 8967917 | Retaining wall system | — | 2015-03-03 |
| 8602691 | Locking mechanism | — | 2013-12-10 |
| 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 |
| 6874975 | Soil-nail apparatus and method for constructing soil reinforced earthen retaining walls | Enayat S. Aziz | 2005-04-05 |
| 6357970 | Compressible welded wire wall for retaining earthen formations | Harold K. Hilfiker | 2002-03-19 |
| 5647695 | Soil filled wall | Harold K. Hilfiker | 1997-07-15 |
| 4391557 | Retaining wall for earthen formations and method of making the same | William K. Hilfiker, Harold O. Hilfiker | 1983-07-05 |
| 4329089 | Method and apparatus for retaining earthen formations through means of wire structures | William K. Hilfiker, Harold O. Hilfiker | 1982-05-11 |
| 4324508 | Retaining and reinforcement system method and apparatus for earthen formations | William K. Hilfiker, Harold O. Hilfiker | 1982-04-13 |