Multi-layer polymeric film and the use thereof
AssigneeDuPont Teijin Films U.S. Limited Partnership
InventorsStephen Sankey, Julia Friend
Life of this patent
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Abstract
The use of a multilayer film to store or retrieve information, said information being correlated to the multilayer structure of the film, and said multilayer film comprising at least two different types of layer, wherein each type of layer exhibits a different optical property and wherein the multilayer film comprises a plurality of layers of each of at least two of the different types of layer; a method of storing information, a method of retrieving stored information and a method of protecting against counterfeiting or fraud, which method utilises said multilayer film.
Claims53
A method of storing information in a multilayer film, the method comprising forming a multilayer film comprising a plurality of layers wherein the plurality of layers comprises at least two layers having a difference from each other in regard to an optical property, said difference forming a pattern across the thickness of the multilayer film at an internal cross section thereof, wherein said information is in the form of a barcode and said pattern defines the barcode.
A security or anticounterfeiting device comprising a multilayer film comprising a plurality of layers, wherein the plurality of layers comprises at least two layers having a difference from each other in regard to an optical property, said difference forming a pattern across the thickness of the multilayer film at an internal cross section thereof, wherein information is present in the device in the form of a barcode and said pattern defines the barcode.
A method of storing information, the method comprising the steps of:
- (i) providing a multilayer film comprising at least two different types of layer having a difference from each other in regard to an optical property, wherein the multilayer film comprises a plurality of said at least two different types of layer ordered within the film such that said difference in said optical property forms a pattern across the thickness of the multilayer film at an internal cross section thereof, thereby forming a barcode;
- (ii) converting the multilayer structure of the film into code by optically scanning the cross-section of the film along an edge thereof;
- and
- (iii) assigning the code to one or more items of information.
A method of retrieving stored information, the method comprising the steps of:
- (i) providing a multilayer film comprising at least two different types of layer having a difference from each other in regard to an optical property, wherein the multilayer film comprises a plurality of said at least two of the different types of layer ordered within the film such that said difference in said optical property forms a pattern across the thickness of the multilayer film at an internal cross section thereof, thereby forming a barcode;
- (ii) interrogating the multilayer film by optically scanning the cross section of the film along an edge thereof and converting the multilayer structure into a code;
- and
- (iii) correlating the code with one or more items of information.
A method of protecting against counterfeiting or fraud, the method comprising the steps of:
- (i) providing a multilayer film comprising at least two different types of layer having a difference from each other in regard to an optical property, wherein the multilayer film comprises a plurality of said at least two of the different types of layer ordered within the film such that said difference in said optical property forms a pattern across the thickness of the multilayer film at an internal cross section thereof, thereby forming a barcode;
- (ii) converting the multilayer structure of the film into a first code by optically scanning the cross-section of the film along an edge thereof;
- (iii) storing the first code in a database;
- (iv) interrogating the multilayer film by optically scanning the cross section of the film along an edge thereof and converting the multilayer structure into a second code;
- and
- (v) correlating the second code so obtained with the first code held in the database.
A method of storing information in the form of a barcode, the method comprising forming a multilayer film comprising a plurality of layers each comprising a film-forming polymer, wherein the plurality of layers comprises at least two layers having a difference from each other in regard to an optical property, said difference forming a pattern across the thickness of the multilayer film at an internal cross section thereof, said pattern consisting of substantially parallel lines coinciding with the layers and defining the barcode.
A method of retrieving information in a multilayer film, the method comprising reading a barcode in a multilayer film comprising a plurality of layers each comprising a film-forming polymer, wherein the plurality of layers comprises at least two layers having a difference from each other in regard to an optical property, said difference forming a pattern across the thickness of the multilayer film at an internal cross section thereof, said pattern consisting of substantially parallel lines coinciding with the layers and defining the barcode.
A method of retrieving information in a multilayer film, the method comprising reading a barcode in a multilayer film comprising a plurality of layers, wherein the plurality of layers comprises at least two layers having a difference from each other in regard to an optical property, said difference forming a pattern across the thickness of the multilayer film at an internal cross section thereof, wherein said information is in the form of a barcode and said pattern defines the barcode.
Dependencies are inferred from the claim text.