Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6394499 | Self-adhesive stamp construction | Max A. DeHerrera, James A. Helzer, Alan Green, Vance P. Mattison, Julia J. Souther | 2002-05-28 |
| 5191972 | Storage and display device for coins and the like | James A. Helzer, Dwight Hayes | 1993-03-09 |