Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5661460 | Distance determination and alarm system | Roy Sallen, Walter James Budzyna, Drew E. Sunstein | 1997-08-26 |
| 5589821 | Distance determination and alarm system | Roy Sallen, W. James Budzyna | 1996-12-31 |
| 5031156 | Method and apparatus for detecting and counting articles | Leonard A. Watts, William A. Johnson | 1991-07-09 |