Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5678396 | Sectioned grooved roller scraper | Phillip Orland Swenson, Ronald L. Reichen | 1997-10-21 |
| 5634325 | Spiral grooved roller mechanism | Richard David Thier, Phillip Orland Swenson | 1997-06-03 |