Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6419854 | Long persistence red phosphors and method of making | Perry Niel Yocom | 2002-07-16 |
| 6379584 | Long persistence alkaline earth sulfide phosphors | Perry Niel Yocom | 2002-04-30 |