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US 5,329,127 AGranted
Method for the identification of plastics
AssigneeBayer Aktiengesellschaft
InventorsArno Becker, Klaus Luttermann, Uwe Claussen, Peter Orth, Ludger Heiliger, Aziz E. Sayed
Life of this patent
Estimating the term…
Abstract
A method of identifying different plastics, wherein each plastic is provided with a plurality of fluorescent dyes which differ in terms of their emission frequencies and/or in terms of the duration of their fluorescence, so that a fluorescence pattern, which is distinguished by the duration of the fluorescence and/or by the frequencies occurring, can unambiguously be assigned to each plastic.
Claims14
A method of identifying different plastics comprising the following steps:
- a) providing each plastic with a plurality of fluorescent marker materials wherein said plurality of fluorescent marker materials contains at least one marker material that has a duration of fluorescence which differs from the duration of fluorescence of the other marker materials and further wherein each plastic is provided with a different combination of said fluorescent marker materials;
- b) exposing the plastics to a source of radiation which will cause the marker materials to fluoresce;
- c) measuring the fluorescence patterns of the plastics after exposure to the radiation in step b);
- and
- d) identifying each plastic by the different durations of fluorescence exhibited in the fluorescence patterns measured in step c).
2 more elements
A method of identifying different plastics comprising the following steps:
- a) providing each plastic with a plurality of fluorescent marker materials wherein said plurality of fluorescent marker materials contains (i) at least one marker material that has a duration of fluorescence which differs from the duration of fluorescence of the other marker materials and (ii) at least one marker material that has an emission frequency that is different from the emission frequency or frequencies of the other marker materials, and further wherein each plastic is provided with a different combination of said fluorescent marker materials;
- b) exposing the plastics to a source of radiation which will cause the marker materials to fluoresce;
- c) measuring the fluorescence patterns of the plastics after exposure to the radiation in step b);
- and
- d) identifying each plastic by the different durations of fluorescence in combination with the different emission frequencies exhibited in the fluorescence patterns measured in step c).
2 more elements
Dependencies are inferred from the claim text.