Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6265884 | Electrical conductivity gem tester | David J. Barrett, Wayne Duderwick, Randolph M. Bogdan | 2001-07-24 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6265884 | Electrical conductivity gem tester | David J. Barrett, Wayne Duderwick, Randolph M. Bogdan | 2001-07-24 |