Security markers for reducing receipt fraud
First Claim
Patent Images
1. A method of reducing receipt fraud, the method comprising:
- illuminating a receipt;
attempting to detect aspects of emission from one or more luminescent markers incorporated in a valid receipt in response to the illumination, wherein each of the one or more luminescent markers comprises a glass doped with one or more rare earth elements, and wherein the aspects of emission comprise a pre-defined rate of change of emission versus time and a pre-defined rate of change of emission versus wavelength comprising a unique luminescent signature assigned to a location at which a valid receipt is issued; and
validating the receipt when the attempt is successful.
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Abstract
A method of reducing receipt fraud comprises attempting to detect emission from a receipt associated with one or more luminescent markers that are incorporated in a valid receipt. The receipt is validated when the attempt is successful.
78 Citations
21 Claims
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1. A method of reducing receipt fraud, the method comprising:
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illuminating a receipt; attempting to detect aspects of emission from one or more luminescent markers incorporated in a valid receipt in response to the illumination, wherein each of the one or more luminescent markers comprises a glass doped with one or more rare earth elements, and wherein the aspects of emission comprise a pre-defined rate of change of emission versus time and a pre-defined rate of change of emission versus wavelength comprising a unique luminescent signature assigned to a location at which a valid receipt is issued; and validating the receipt when the attempt is successful. - View Dependent Claims (2, 3)
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4. A method of reducing receipt fraud, the method comprising:
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illuminating a receipt incorporating one or more luminescent markers, wherein each of the one or more luminescent markers comprises a glass doped with one or more rare earth elements; detecting luminescent emission from the one or more luminescent markers in response to the illumination; calculating a rate of change in luminescent emission versus time and a rate of change in luminescent emission versus wavelength from the detected luminescent emission; comparing the calculated rates of change in luminescent emission versus time and wavelength with a pre-defined rate of change in luminescent emission versus time and a pre-defined rate of change in luminescent emission versus wavelength comprising a unique luminescent signature assigned to a location at which a valid receipt is issued; and validating the receipt when the calculated rates of change in luminescent emission versus time and wavelength match the unique luminescent signature assigned to the location. - View Dependent Claims (5, 6, 7, 8)
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9. A device for reducing receipt fraud, the device comprising:
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an illumination source which illuminates a receipt incorporating one or more luminescent markers, wherein each of the one or more luminescent markers comprises a glass doped with one or more rare earth elements; a detector which detects emission from the one or more luminescent markers in response to the illumination; and a processor which (i) computes a rate of change in the detected emission versus time and a rate of change in the detected emission versus wavelength, (ii) compares the computed rates of change with a pre-defined rate of change in emission versus time and a pre-defined rate of change in emission versus wavelength comprising a unique luminescent signature assigned to a location at which a valid receipt is issued, and (iii) validates the receipt when the computed rates of change match the unique luminescent signature assigned to the location. - View Dependent Claims (10, 11, 12)
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13. A method of reducing receipt fraud, the method comprising:
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receiving a receipt including indicia claiming that the receipt was issued at a particular location; illuminating the receipt to stimulate luminescence from one or more luminescent markers incorporated in a valid receipt issued from the particular location, wherein each of the one or more luminescent markers comprises a glass doped with one or more rare earth elements a pre-defined rate of change in emission versus time and a pre-defined rate of change in luminescent emission versus wavelength from which comprise a unique luminescent signature assigned to the particular location; attempting to detect the unique luminescent signature; and identifying the receipt as a forgery in the event that the unique luminescent signature is not detected. - View Dependent Claims (14)
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15. A method of reducing receipt fraud, the method comprising:
producing receipt paper comprising one or more luminescent markers, wherein each of the one or more luminescent markers comprises a glass doped with one or more rare earth elements a pre-defined rate of change in emission versus time and a pre-defined rate of change in emission versus wavelength from which comprise a unique luminescent signature assigned to a location at which a valid receipt is issued. - View Dependent Claims (16, 17, 18, 19, 20, 21)
Specification