Warning device for the brake fluid of hydraulic brake systems of vehicles
US4932247A · kind A · utility
4Cited by
2References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Jul 25, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T17/22
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A warning device for detecting mineral oil impurities in the brake fluid of hydraulic vehicle brake systems is described. The warning device comprises a body which is arranged in the brake fluid and can swell as a result of mineral oil and the change of shape of which indicates the presence of mineral oil impurities. The indication is given particularly as a result of the fact that the change in shape brought about by the swelling causes the opening or closing of an electrical circuit and thereby actuates a visual or acoustic indicator in the dashboard of the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.