Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4566545 | Coring device with an improved core sleeve and anti-gripping collar with a collective core catcher | Arthur L. Story | 1986-01-28 |
| 4512423 | Coring device with an improved weighted core sleeve and anti-gripping collar | James T. Aumann | 1985-04-23 |