Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5174237 | Grade marker | — | 1992-12-29 |
| 4957170 | Curb and gutter shovel | — | 1990-09-18 |
| 4813494 | Stake driver | Larry L. Brigman, John C. Roderick | 1989-03-21 |
| 4187901 | Flat plate solar heat collector | Robert A. Coleman | 1980-02-12 |