Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7754112 | Methods for forming security articles having diffractive surfaces and color shifting backgrounds | Patrick K. Higgins, Charles T. Markantes, Roger W. Phillips | 2010-07-13 |
| 7224528 | Optically variable security devices | Roger W. Phillips, Patrick K. Higgins, Charles T. Markantes | 2007-05-29 |
| 7029745 | Security articles having diffractive surfaces and color shifting backgrounds | Patrick K. Higgins, Charles T. Markantes, Roger W. Phillips | 2006-04-18 |
| 7005178 | Security articles having diffractive surfaces and color shifting backgrounds | Patrick K. Higgins, Charles T. Markantes, Roger W. Phillips | 2006-02-28 |
| 6761959 | Diffractive surfaces with color shifting backgrounds | Patrick K. Higgins, Charles T. Markantes, Roger W. Phillips | 2004-07-13 |
| 6118377 | Conductive security article with detector apparatus | Christopher W. Lantman | 2000-09-12 |
| 6031457 | Conductive security article and method of manufacture | Christopher W. Lantman | 2000-02-29 |
| 4321485 | High-frequency transistor switch | Merle Morozowich | 1982-03-23 |