Patents per Year
Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5485520 | Automatic real-time highway toll collection from moving vehicles | David Chaum | 1996-01-16 | $1,258,000 |
| 5055659 | High speed system for reading and writing data from and into remote tags | Donald F. Speirs, Michael A. Wolf | 1991-10-08 | |
| 4864158 | Rapid signal validity checking apparatus | Alfred R. Koelle, Donald F. Speirs | 1989-09-05 |