Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6203867 | Product package having reliable openability | William J. Derkach, Robert F. Hawkins | 2001-03-20 |
| 5829227 | Product package having reliable openability | William J. Derkach, Robert F. Hawkins | 1998-11-03 |
| 5689935 | Product package having reliable openability | William J. Derkach, Robert Hawkins | 1997-11-25 |