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US4298348A
Expired / Lapsed
US
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Time-temperature indicator composition
Assignee: Lifelines Technology Inc
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Filing: 1980-03-03
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Granted: 1981-11-03
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Expires: 2000-03-03
Abstract
Abstract An improved recording device is described, useful for measuring the integrated time-temperature or integrated radiation-dosage history of an article, comprising a substrate onto which 2,4-hexadiyn-1,6-diol-bis-(p-chlorobenzenesulfonate) is deposited. The inactive form is capable of being converted by melt recrystallization to an active form, which undergoes 1,4-addition polymerization resulting in an irreversible, progressive color change. The color change produced at any given point in time represents an integrated time-temperature history of thermal annealing or integrated radiation-dosage history of exposure to actinic radiation to which an article has been exposed. Also described is a process for converting an inactive form of 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate) to its active form by thermal recrystallization.
Inventors
- 👤 Dawn M. Ivory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:35
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/229
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
42 words
A process for activating a recording device including a substrate having deposited thereon 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate) in an inactive form which comprises heating the device above the melting point of the inactive form and cooling the device to form an active form of 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate).
Claim 2
Dependent Claim
42 words
A process for activating a recording device including a substrate having deposited thereon 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate) in an inactive form which comprises heating the device above the melting point of the inactive form and cooling the device to form an active form of 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate).
Claim 3
Dependent Claim
51 words
A process for measuring the integrated time-temperature history of thermal annealing or integrated radiation-dosage history of exposure to actinic radiation, to which an article has been subjected, comprising applying to said article an inactive form of 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate) and converting the inactive form in situ to an active form by melt recrystallization.
Claim 4
Dependent Claim
51 words
A process for measuring the integrated time-temperature history of thermal annealing or integrated radiation-dosage history of exposure to actinic radiation, to which an article has been subjected, comprising applying to said article an inactive form of 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate) and converting the inactive form in situ to an active form by melt recrystallization.
Claim 5
Dependent Claim
34 words
A process of forming an active time-temperature indicator composition which comprises heating the inactive form of 2,4-hexadiyn-1,6-diol-bis-(p-chlorobenzenesulfonate) above its melting point and cooling the melt to form crystals of an active form of 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate).
Claim 6
Dependent Claim
34 words
A process of forming an active time-temperature indicator composition which comprises heating the inactive form of 2,4-hexadiyn-1,6-diol-bis-(p-chlorobenzenesulfonate) above its melting point and cooling the melt to form crystals of an active form of 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate).
Claim 7
Dependent Claim
37 words
In a combination of a substrate susceptible to adverse effects on exposure to heat or actinic radiation for a measurable period and an acetylenic time-temperature indicator composition, the improvement wherein the acetylenic time-temperature indicator composition is 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate).
Claim 8
Dependent Claim
37 words
In a combination of a substrate susceptible to adverse effects on exposure to heat or actinic radiation for a measurable period and an acetylenic time-temperature indicator composition, the improvement wherein the acetylenic time-temperature indicator composition is 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate).
Claim 9
Dependent Claim
13 words
The combination of claim 4 wherein the 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate) is in an active form.
Claim 10
Dependent Claim
16 words
The combination of claim 4 wherein 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate) is in an inactive form activatable by thermal recrystallization.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |