Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879253 | Method for fabricating a semiconductor device using a BPSG layer containing high concentrations of phosphorus and boron | — | 1989-11-07 |
| 4839306 | Method of manufacturing a trench filled with an insulating material in a semiconductor substrate | — | 1989-06-13 |
| 4835301 | Process for producing stable .alpha.-L-aspartyl-L-phenylalanine methyl ester | Shigeaki Irino, Tsuneo Harada, Akira Tokuda, Kiyotaka Oyama | 1989-05-30 |
| 4831180 | Process for producing alpha-L-aspartyl-L-phenylalanine methyl ester having an improved solubility | Shigeaki Irino, Tsuneo Harada, Akira Tokuda, Hiyotaka Oyama | 1989-05-16 |
| 4810818 | Process for producing alpha-aspartyl-l-phenylalanine methyl ester having an improved solubility | Shigeaki Irino, Tsuneo Harada, Akira Tokuda, Kiyotaka Oyama | 1989-03-07 |