Thermal paper with a near infrared radiation scannable data image
First Claim
Patent Images
1. A thermal paper with at least one near infrared radiation scannable data image comprised of a near infrared fluorescent (NIRF) compound positioned thereon.
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Abstract
Thermal paper having a near infrared radiation scannable data image comprised of near infrared flourescent compounds provides scannable data invisible to the naked eye with little interference from printed text or images on the thermal paper. The near infrared fluorescent pigments are protected from contact with oxygen using a polymer resin. Thermal papers with overlapping bar codes can be prepared when using two or more near infrared radiation scannable bar codes that respond to different wavelengths. The overlapping bar codes provide more information in a given area.
68 Citations
19 Claims
- 1. A thermal paper with at least one near infrared radiation scannable data image comprised of a near infrared fluorescent (NIRF) compound positioned thereon.
- 2. A thermal paper with at least one near infrared radiation scannable data image positioned thereon, wherein said near infrared radiation scannable data image comprises a near infrared-fluorescent (NIRF) compound which reflects near infrared radiation in the range of from 670 nm to 2,500 nm and a polymer resin which limits contact of the near infrared-fluorescent compound with air.
- 11. A thermal paper with at least one near infrared radiation scannable data image positioned thereon which comprises a near infrared flourescent (NIRF) compound which reflects near infrared radiation in the range of from 670 nm to 2500 nm and a polymer resin which limits contact of the near infrared-flourescent compound with air, wherein the near infrared scannable image further comprises a uniform coating of NIRF compounds positioned on the thermal paper and a mask positioned over the uniform coating of NIRF compounds, wherein said mask comprises activated portions of the thermosensitive coating which absorbs near infrared radiation in the range of 670 nm to 2500 nm and which is of a pattern that defines said near infrared radiation scannable data image through exposed portions of the uniform coating of NIRF compounds.
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14. A thermal paper which comprises a base substrate, a base coating, a thermosensitive coating positioned on said base coating and at least one near infrared radiation scannable data image positioned on:
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a) said base coating, b) said thermosensitive coating, c) an optional top coating, d) an optional back coating, e) said base substrate;
orf) a combination of a), b), c), d) and e); said near infrared radiation scannable data image comprising a patterned layer that contains a near infrared fluorescent (NIRF) compound which reflects radiation in the range of 670 nm to 2,500 nm and a polymer resin which limits contact of the NIRF compound with air.
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15. A thermal paper which comprises a base substrate, a base coating, a thermosensitive coating positioned on said base coating, a near infrared fluorescent compound uniformly incorporated in:
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a) said base coating, b) said thermosensitive coating, c) an optional top coating, d) an optional back coating, e) said base substrate;
orf) a combination of a), b), c), d) and e); and a patterned mask in a pattern reverse of a scannable data image comprised of activated portions of the thermosensitive layer such that the unactivated portions of the thermosensitive layer are in the form of a scannable data image. - View Dependent Claims (16, 17)
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18. A thermal paper with overlapping bar codes wherein each of the overlapping bar codes is a near infrared radiation scannable bar code comprised of a different near infrared fluorescent compound that reflects near infrared radiation at a different wave length within the range of 670 nm to 2,500 nm.
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19. A method for preparing a thermal paper with a near infrared radiation scannable bar code which comprises:
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a) forming a uniform layer of NIRF compounds on said thermal paper, wherein the amount of said NIRF compounds in the uniform layer is sufficient to be sensed by a photon detector operating in the near infrared region of 670 to 2,500 nm; and b) thermally activating the thermosensitive coating of the thermal paper in the pattern of a reverse bar code;
said activated thermosensitive coating comprising a near infrared radiation absorbing dye which absorbs near infrared radiation in the range of 670 nm to 2500 nm.
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Specification