Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9634836 | Key shadowing | — | 2017-04-25 |
| 7518531 | Traffic control device transmitter, receiver, relay and display system | George Butzer | 2009-04-14 |
| 7167105 | Traffic control device transmitter, receiver, relay and display system | George Butzer | 2007-01-23 |
| 6747574 | Traffic control device transmitter, receiver, relay and display system | George Butzer | 2004-06-08 |
| 5974668 | Irising cigar cutter | — | 1999-11-02 |
| 5483346 | Polarization based optical sensor utilizing total internal reflection | — | 1996-01-09 |