Machine oil deterioration detection
US4675662A · kind A · utility
34Cited by
0References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Aug 1, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01M2011/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A machine oil deterioration detection apparatus having a copper thin film resistor formed on an electrically insulating holding member and immersed in a machine oil. The copper thin film resistor is corroded by acid produced in accordance with deterioration of the machine oil, thus changing the resistance of the resistor. The change in resistance is detected by a detection circuit, connected to the thin film resistor, for detecting the resistance of the thin film resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.