Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876141 | Double layer pavement marking sheet material | Sadao Kobayashi, Yuji Ishihara, Kouichi Ijichi | 1989-10-24 |
| 4873559 | Semiconductor memory device and a process for producing the same | Shinji Shimizu, Osamu Tsuchiya | 1989-10-10 |
| 4839865 | Selective application of voltages for testing storage cells in semiconductor memory arrangements | Hiroshi Kawamoto, Kazumasa Yanagisawa | 1989-06-13 |