Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867248 | Shank mounting assembly for soil opening point | Donald E. Williams | 1989-09-19 |
| 4773340 | Subsoil applicator | Robert A. Williams, Donald E. Williams | 1988-09-27 |
| 4598654 | Furrow opener and follower blade | Donald E. Williams | 1986-07-08 |
| 4483401 | Trash clearing assembly for farm implements | — | 1984-11-20 |
| 4446927 | Ground penetrating tool for farm implement shanks | — | 1984-05-08 |
| 4425973 | Trash clearing disc assembly for planters | Donald E. Williams | 1984-01-17 |
| 4321972 | Seed planter furrow opener and follower therefor | Donald E. Williams | 1982-03-30 |
| 4295532 | Planter with cooperating trash clearing discs | Donald E. Williams, C. Dean Gigot, Terry K. Gigot | 1981-10-20 |
| 4269274 | Streamlined wear-resistant deep tillage tool | Donald E. Williams | 1981-05-26 |