Automotive windshield wiper blade with service life indicator
US6047436A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1997 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | Nov 11, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60S2001/3844
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An improved windshield wiper system having a cumulative ozone indicator (20) disposed in proximity to a wiper blade (10) which gives a visual cue when the wiper blade (10) should be replaced. The exposure to a predetermined amount of ozone causes the indicator (20) to change its color and thus communicate to the vehicle operator that it is time to change wiper blade (10). Rather than changing color the indicator (20) can be a pop up device which can be observed by the vehicle operator. To allow a reaction with ozone but to prevent damage from contact with a liquid the indicator (20) is covered with a gas permeable and liquid impermeable material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.