Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7100761 | Rotatable coin display | Max A. DeHerrera | 2006-09-05 |
| 6394499 | Self-adhesive stamp construction | David P. Hanefeld, Max A. DeHerrera, Alan Green, Vance P. Mattison, Julia J. Souther | 2002-05-28 |
| 5191972 | Storage and display device for coins and the like | David P. Hanefeld, Dwight Hayes | 1993-03-09 |
| 4364537 | Adjustable plate holder | — | 1982-12-21 |
| D266461 | Adjustable plate holder | — | 1982-10-12 |