Thermal transfer printing ribbon for printing security bar code symbols
AssigneeAT&T Global Information Solutions Company
InventorsShashi G. Talvalkar, Marion E. McCreight
Life of this patent
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Abstract
Thermal transfer printing ribbon for printing security bar code symbols wherein the thermal transfer printing ribbon has been overprinted or overcoated in specific predetermined locations with a coating which has magnetic recognition characteristics. The difference in printed bar code symbols is invisible to the human eye and bar-code scanning equipment, but can be readily detected using a device capable of recognizing a magnetic signal.
Claims18
A thermal transfer printing ribbon for printing security bar code symbols, comprising:
- a base having a top surface;
- a first visible coating layer adhered to said top surface of said base, said first visible coating layer having a top surface;
- and
- a second magnetic recognition characteristics coating layer adhered to said top surface of said first visible coating layer.
A security bar code symbol, comprising a plurality of vertical bars, wherein a predetermined portion of said security bar code symbol less than the entire security bar code symbol has magnetic recognition characteristics which are detectable by a device capable of detecting a magnetic signal.
A security bar code, comprising a plurality of vertical bars, wherein a predetermined portion of said security bar code symbol has magnetic recognition characteristics which are detectable by a device capable of detecting a magnetic signal and wherein said predetermined portion is a horizontal stripe extending across a portion of said plurality of vertical bars.
A security bar code symbol, comprising a plurality of vertical bars, wherein a first portion of said vertical bars have magnetic recognition characteristics which are detectable by a device capable of detecting a magnetic signal and a second portion of said vertical bars do not have magnetic recognition characteristics and are not detectable by a device capable of detecting a magnetic signal.
Dependencies are inferred from the claim text.