Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5046096 | Windowed rotatable cover which reveals one indicia on one surface and a second indicia on a second surface corresponding to the first that encodes and decodes messages | Marvin G. Kuhlman, J. A. Brhel | 1991-09-03 |