Sortation method for transparent optically active articles
US5603413A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1994 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Sep 1, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S209/938
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of and apparatus for sorting plastic items is disclosed. The method comprises the steps of transmitting polychromatic light from a source through each individual item; detecting the quantity of light of a first color passing through each individual item with a detector opposed to the source as a stream of the items is successively directed past the source and the detector; detecting the quantity of light of a second color passing through each individual item with the detector, wherein the second color is different from the first color; and selectively removing individual items from the stream, the removal being based upon a comparison of the quantity of light of the first color detected and the quantity of light of the second color detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.