Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885257 | Gettering process with multi-step annealing and inert ion implantation | — | 1989-12-05 |
| 4862000 | Method for predicting density of micro crystal defects in semiconductor element from silicon wafer used in the manufacture of the element, and infrared absorption measurement apparatus for this method | Atsuko Kubota, Yoshiaki Ohwada | 1989-08-29 |
| 4837610 | Insulation film for a semiconductor device | Hachiro Hiratsuka, Shintaro Yoshii | 1989-06-06 |
| 4805419 | Absorption type heat exchanging apparatus | Tetsuro Furukawa, Kensuke Yoshikawa, Mitsuru Mizuuchi, Masaharu Furutera, Nobuharu Sakabata +2 more | 1989-02-21 |