Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6800990 | Cathode material including rare earth metal used as electron emission source for electron beam apparatus | Jong-Seo Choi, Hyek-Bok Lee, Yoon-Chang Kim | 2004-10-05 |
| 6791251 | Metal cathode and indirectly heated cathode assembly having the same | Dong-Kyun Seo, Jong-Seo Choi, Kyoung-Cheon Son, Sung-Hwan Moon, Yoon-Chang Kim +2 more | 2004-09-14 |
| 6762544 | Metal cathode for electron tube | Yoon-Chang Kim, Dong-Kyun Seo, Bu-Chul Sin | 2004-07-13 |