Environmental history monitor with positional displacement and security features

Patent metadata

Field	Value
Publication number	US-11738587-B2
Application number	US-202217666071-A
Country	US
Kind code	B2
Filing date	Feb 7, 2022
Priority date	Sep 17, 2020
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

Environmental monitors for monitoring a predetermined environmental exposure, for example, an historical heat exposure such as a cumulative ambient heat exposure and/or a peak ambient heat exposure may include an environmental indicator material and a security material. The environmental monitor may be configured to attach to a host product for monitoring the predetermined environmental exposure of the host product, and additionally serve as an anti-counterfeiting indicator.

First claim

The invention is claimed as follows:

1. A historical temperature exposure monitor comprising:
a substrate;
an optically readable, thermally sensitive indicator element supported by the substrate, the indicator element further comprising an indicator material configured to move in response to a predetermined temperature exposure; and
a security material supported by the substrate and further comprising:
a luminescent material configured to emit light of a predetermined color responsive to being exposed to specific light wavelengths.

2. The historical temperature exposure monitor of claim 1 , where the predetermined temperature exposure is selected from the group consisting of freezing exposure, thawing exposure, peak temperature exposure, cumulative heat exposure, and combinations thereof.

3. The historical temperature exposure monitor of claim 1 , wherein the luminescent material is, prior to exposure to the specific light wavelengths, undetectable to a naked eye under ambient lighting conditions.

4. The historical temperature exposure monitor of claim 1 , wherein the appearance of a predetermined color is undetectable to a naked eye.

5. The historical temperature exposure monitor according to claim 1 , wherein the specific light wavelengths are in a range selected from the group consisting of 10-400 nm, 10-380 nm, 10-100 nm, 100-280 nm, 280-315 nm, 315-400 nm, 180-380 nm, 180-400 nm, 100-400 nm, 100-315 nm, 280-400 nm, 400-500 nm, 700 nm-1 mm, 700 nm-1.1 μm, about 780 nm-1.4 μm, 1.4-3 μm, and 3 μm-1 mm.

6. The historical temperature exposure monitor according to claim 1 , wherein the security material includes the luminescent material which comprises (a) at least one component selected from the group consisting of: a phosphorescent material, a fluorescent material, a phosphorescent dye, a phosphorescent ink, a fluorescent dye, and a fluorescent ink.

7. The historical temperature exposure monitor according to claim 1 , wherein the luminescent material is configured to emit light of the predetermined color when exposed to the specific light wavelengths, and the emission of light of the predetermined color remains for at least a predetermined interval after cessation of illumination with the specific light wavelengths.

8. The historical temperature exposure monitor according to claim 7 , wherein the predetermined interval is 0.1-60 seconds.

9. The historical temperature exposure monitor according to claim 7 , wherein the predetermined interval is 1-15 seconds.

10. The historical temperature exposure monitor according to claim 9 , wherein the luminescent material includes an UV ink selected from the group consisting of a green UV ink, a blue UV ink, a pink UV ink, a yellow UV ink, a red UV ink, a clear UV ink, and combinations thereof.

11. The historical temperature exposure monitor according to claim 1 , wherein the luminescent material is a phosphorescent component selected from the group consisting of Green Phosphorescent Pigment Powder, Red ZnS Phosphorescent Pigment Powder, Red CaS Phosphorescent Pigment Powder, Strontium Aluminate, CaS, ZnS, SiO 2 , Calcium Sulfide, Strontium Aluminate Euporium Dysprosium, Yttirium Oxide, ZnS:Cu, and combinations thereof.

12. The historical temperature exposure monitor according to claim 1 , wherein the indicator element is inactive below a base temperature and being thermally responsive at or above an activation temperature to record irreversibly with respect to time cumulative ambient temperature exposure above the activation temperature, the activation temperature being equal to or greater than the base temperature.

13. The historical temperature exposure monitor according to claim 11 , wherein the indicator material is a meltable solid at or below the base temperature in its initial state, and melts to be a viscous liquid at or above a determined temperature and begins to flow.

14. The historical temperature exposure monitor according to claim 12 , wherein the indicator element comprises a transport member supporting the indicator material, a displacement of the indicator material is a displacement with respect to the transport member, and a displacement of the security material is a displacement with respect to the transport member.

15. The historical temperature exposure monitor according to claim 13 , wherein the security material is mixed into and is part of the indicator material, so that the security material is displaced with respect to the transport member together with the indicator material, and the displacement of the security material is the same as the displacement of the indicator material.

16. The historical temperature exposure monitor according to claim 13 , wherein the security material is not part of the indicator material and a displacement of the indicator material conceals or reveals the security material.

17. A historical temperature exposure monitor comprising:
a substrate;
an optically readable, thermally sensitive indicator element supported by the substrate, the indicator element further comprising an indicator material configured to move in response to a predetermined temperature exposure; and
a security material supported by the substrate and further comprising
a photochromic material configured to temporarily change color state responsive to being exposed to the specific light wavelengths.

18. The historical temperature exposure monitor according to claim 17 , wherein the photochromic material comprises at least one component selected from the group consisting of an organic metal compound including triarylmethanes, stilbenes, azastilbenes, nitrones, fulgides, spiropyrans, naphthopyrans, spiro-oxazines, quinones, photochromic quinones, phenoxynaphthacene quinone, diarylethenes, azobenzenes, and dithizonates of metals; an inorganic photochromic compound including silver chloride, silver halides, zinc halides, yttrium oxyhydride, silicate photochromic glasses containing silver halide microcrystals including AgBr or AgCl, activated crystals of alkali metal-halide compounds including KCl, KBr or NaF, and doped salts or oxides of alkaline-earth metals including CaF 2 /La, Ce or SrTiO 3 /Fe+Mo; a photochromic coordination compound including a sodium nitroprusside compound or a ruthenium sulfoxide compound; and combinations thereof.

19. The historical temperature exposure monitor according to claim 18 , wherein the photochromic material comprises at least one component selected from the group consisting of spiropyrans, naphthopyrans, and spiro-oxazines.

20. The historical temperature exposure monitor of claim 17 , wherein the change of color state of the photochromic material is a change in reflectivity, a change in transparency, a change in hue, and/or a change in apparent color when exposed to the specific light wavelengths.

21. The historical temperature exposure monitor of claim 17 , where the predetermined temperature exposure is selected from the group consisting of freezing exposure, thawing exposure, peak temperature exposure, cumulative heat exposure, and combinations thereof.

22. The historical temperature exposure monitor of claim 17 , wherein the security material includes the photochromic material which is undetectable to a naked eye under ambient lighting conditions before the photochromic material changes color state responsive to being exposed to the specific light wavelengths.

23. The historical temperature exposure monitor of claim 17 , wherein the security material includes the photo

Assignees

• Temptime Corp

Inventors

• Smith Marielle K
• Abdo Mohannad
• Do Thi N
• Huffman Brian S

Classifications

• B42D25/378 Primary

  Special inks · CPC title

• B42D25/29

  Securities; Bank notes · CPC title

• B42D25/405

  Marking · CPC title

• B42D25/387 Primary

  absorbing or reflecting ultraviolet light · CPC title

• G01K3/04 Primary

  in respect of time · CPC title