Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4343572 | Apparatus and method for anchoring the rigid face of a retaining structure for an earthen formation | — | 1982-08-10 |
| 4329089 | Method and apparatus for retaining earthen formations through means of wire structures | Harold O. Hilfiker, William B. Hilfiker | 1982-05-11 |
| 4324508 | Retaining and reinforcement system method and apparatus for earthen formations | Harold O. Hilfiker, William B. Hilfiker | 1982-04-13 |