The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 1990
Filed:
May. 19, 1988
Robert D Rosenthal, Gaithersburg, MD (US);
Trebor Industries, Inc., Gaithersburg, MD (US);
Abstract
Method and apparatus for sorting desired pieces of material from undesired material present in mixtures thereof. A piece of material from a mixture of pieces of desired and undesired materials is irradiated with a plurality of wavelengths of near-infrared radiation. The absorptions by the irradiated piece of near-infrared radiation energy is measured at a plurality of wavelengths. The measured absorptions are sequentially compared to a successive series of predetermined different absorption criteria in a predetermined order, which criteria distinguish the desired material from undesired material. If the piece fails any one criterion, it is rejected, whereas if the piece passes all criteria, it is accepted as a desired piece.