Brake fluid testing device
US5028144A · kind A · utility
Inventor
Key dates
| Filing date | Aug 8, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Aug 8, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A brake fluid tester for measuring the quality of brake fluid, comprising means for measuring the conductivity of the brake fluid, preferably comprising a plurality of comparators for comparing the resistance of the brake fluid to a plurality of reference, resistances. The device further comprises indicating means, preferably light emitting diodes, responsive to the measuring means for indicating the quality of the brake fluid based upon its measured conductivity. An increasing number of diodes are illuminated as the conductivity of the brake fluid increases, providing a positive indication when the device is working and providing an easy to interpret display of the test results. The diodes are preferably activated at preselected levels of conductivity, corresponding to preselected levels of moisture contamination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.