Gauge for measuring carpet soiling
US4298282A · kind A · utility
Inventor
Key dates
| Filing date | May 9, 1980 |
| Grant date | Nov 3, 1981 |
| Priority date | — |
| Expiry date | May 9, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/293
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A soil gauge for measuring the relative amount of soiling of a carpet. The soil gauge is made from a transparent material having several viewing areas. The viewing areas are covered with a multiplicity of opaque marks in varying degrees of concentration. An unsoiled sample of carpet is placed next to the carpet to be tested and the soil gauge is placed between the unsoiled sample and the user's line of vision. When the appearance of the unsoiled carpet, as viewed through the gauge, is as close in appearance as possible to the soiled carpet, the position along the gauge through which this similar appearance is achieved is noted, and this position is a measurement of the relative soiling of the carpet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.