Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D599970 | Waste receptacle | — | 2009-09-08 |
| D305096 | Retractable blade knife | Christopher Collins, Cvetan Petroff, Gordon Bremmer | 1989-12-19 |
| D303921 | Utility knife or similar article | Alfred Blochlinger, Christopher Collins, Cvetan Petroff | 1989-10-10 |
| D303731 | Knife scabbard | Alfred Blochlinger, Christopher Collins, Cvetan Petroff | 1989-10-03 |
| D298399 | Knife handle or similar article | Alfred Blochlinger, Christopher Collins, Cvetan Petroff | 1988-11-08 |
| D296498 | Knife scabbard or similar article | Christopher Collins, Cvetan Petroff, Alfred Blochlinger | 1988-07-05 |