IP Library Granted Patent US 12,130,502
Granted Patent B2
US 12,130,502 · App. 17/942,828 · Granted Oct 29, 2024

Carbon dioxide sensing color changeable dyes for indicating exposure, methods of making and using such dyes, and apparatuses incorporating such dye

Inventor: Gregory Heacock (Maple Valley, WA)
Assignee: THERMOGRAPHIC MEASUREMENTS LIMITED
G02C7/04A61B17/3211G01N33/52G02C7/049A61B2090/0807A61B2090/0814Y10T436/204998
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Quick Facts
Patent No.
US 12,130,502
App. No.
17/942,828
Granted
Oct 29, 2024
Kind
B2
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 (7)

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.

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

Assignments (3)
SECURITY INTEREST Recorded Oct 15, 2024
From: THERMOGRAPHIC MEASUREMENTS LIMITED
To: BARINGS FINANCE LLC
Reel/Frame 068895/0356 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 10, 2023
From: SENSOR INTERNATIONAL, LLC
To: THERMOGRAPHIC MEASUREMENTS LIMITED
Reel/Frame 063590/0203 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 12, 2022
From: HEACOCK, GREGORY L.
To: SENSOR INTERNATIONAL, LLC
Reel/Frame 061064/0490 →
Continuity (2)
Continuation 14292246 · May 30, 2014
Related Publication 20230244090A1 · Aug 3, 2023