# US 12,130,502 B2 · Carbon dioxide sensing color changeable dyes for indicating exposure, methods of making and using such dyes, and apparatuses incorporating such dye

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- Number: US 12,130,502 B2
- Document ID: US12130502B2
- Status: Granted
- Kind: B2
- Application number: 17/942,828
- Filed: 2022-09-12
- Published: 2023-08-03
- Granted: 2024-10-29
- Earliest claimed: 2014-05-30
- Assignees: Thermographic Measurements Ltd
- Applicants: Thermographic Measurements Limited
- Inventors: Gregory Heacock
- Web page: https://patentgrep.com/patent/US12130502B2

## CPC

- G02C 7/04: Contact lenses for the eyes (disinfection or sterilisation of contact lenses A61L12/00)
- A61B 17/3211: Surgical scalpels, knives; Accessories therefor
- G01N 33/52: Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper {and including single- and multilayer analytical elements (immunological elements G01N33/54386; involving labelled immunochemicals G01N33/58; for haemoglobin or occult blood G01N33/72)}
- G02C 7/049: {Contact lenses having special fitting or structural features achieved by special materials or material structures}
- A61B 2090/0807: {Indication means}
- A61B 2090/0814: {Preventing re-use}
- Y10T 436/204998: Inorganic carbon compounds
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

According to embodiments of the present application, a carbon dioxide sensing color changeable dye can comprise a carbon dioxide status indicator, a solvent, a polymer wherein the carbon dioxide status indicator is dispersed, an optional plasticizer, and an optional agent to facilitate mixing. The color changeable dye is a first color in the presence of a carbon dioxide rich environment and is capable of changing to a second color upon exposure to atmospheric condition for a period of time corresponding to the intended use time of a restricted, disposable or limited use product. Methods of making and using the color changeable dye and apparatuses incorporating such dye are also disclosed.

## Claims

### Claim 1

An apparatus with color change indication comprising: a packaging comprising:
a higher than atmospheric carbon dioxide environment;
at least one indicator strip comprising a substrate disposed in the packaging;
a color changeable dye comprising a carbon dioxide status indicator disposed on the indicator strip; and
a polymeric barrier disposed on the color changeable dye;
wherein said color changeable dye is time controlled and configured to change color after exposure to atmospheric conditions for a predetermined time and wherein the higher than atmospheric carbon dioxide environment is above 60% carbon dioxide.

### Claim 2 (depends on 1)

The apparatus of claim 1 wherein the higher than atmospheric carbon dioxide environment is above 80% carbon dioxide.