Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853461 | Method of isolating copolymers of vinylpyridine and styrene | Yeong-Ho Chang | 1989-08-01 |
| 4837004 | Rumen-stable pellets | Stephen H. Wu, Shane Kipley Kirk, Kenneth P. Perry, E. Phillip Smith, Yeong-Ho Chang | 1989-06-06 |