Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4643618 | Soil reinforced cantilever wall | Arthur L. Hilfiker | 1987-02-17 |
| 4618283 | Archway construction utilizing alternating reinforcing mats and fill layers | — | 1986-10-21 |
| 4616959 | Seawall using earth reinforcing mats | — | 1986-10-14 |
| 4391557 | Retaining wall for earthen formations and method of making the same | Harold O. Hilfiker, William B. Hilfiker | 1983-07-05 |
| 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 |
| 4266890 | Retaining wall and connector therefor | — | 1981-05-12 |
| 4260296 | Adjustable cap for retaining walls | — | 1981-04-07 |