Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9451681 | Feedback circuit for a display sign and method | Charles L. Lindsay | 2016-09-20 |
| 7602305 | Feedback circuit for a display sign and method | Charles L. Lindsay | 2009-10-13 |