Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4341404 | Security document using a variable dot screen | Kathleen M. Gerew | 1982-07-27 |
| 4310180 | Protected document and method of making same | Michael J. McElligott, Victor J. Tkalenko, Jr., Joseph Baran | 1982-01-12 |