Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6800990 | Cathode material including rare earth metal used as electron emission source for electron beam apparatus | Hyek-Bok Lee, Kyu-Nam Joo, Yoon-Chang Kim | 2004-10-05 |
| 6791251 | Metal cathode and indirectly heated cathode assembly having the same | Dong-Kyun Seo, Kyoung-Cheon Son, Kyu-Nam Joo, Sung-Hwan Moon, Yoon-Chang Kim +2 more | 2004-09-14 |