Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845476 | Proximity detector between a metallic mass and an element to which is applied an electric voltage | Gilbert Rangeard, Jean-Louis Thomas | 1989-07-04 |
| 4833660 | Device for detecting the presence of frost and/or for measuring the thickness of frost by ultrasound and frost probe usable in such a device | Alain Deom, Didier Guffond | 1989-05-23 |