Patent US3704985A successfully refreshed from Google Patents.
US3704985A
Expired / Lapsed
US
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Temperature indicator
Assignee: Bio Medical Sciences Inc
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Filing: 1971-03-04
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Granted: 1972-12-05
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Expires: 1991-03-04
Abstract
Abstract Temperature indicators are provided comprising a heat-conductive carrier having at least one, but preferably a plurality of regions (cavities) thereon, each region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature different from the temperature of the change of state of the thermally responsive substance in any other region. The temperatures at which such changes of state occur are detected visually by an indicator system which is intimately associated with the thermally responsive materials in these regions. The incorporation of certain organic compounds into the indicator system accelerates visual detection of such change of state, thus permitting rapid measurement of the temperature corresponding to the incipient fusion of the thermally responsive material in each region.
Inventors
- 👤 Charles G Pickett
- 👤 Desh D Chadha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:50
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06; G01K13/00; G01K13/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
76 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having at least one region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature, and an indicator means intimately associated with said thermally responsive substance, said indicator means comprising a compound which forms a eutectic mixture with said thermally responsive substance, and said compound having a melting point higher than the highest melting thermally responsive substance.
Claim 2
Dependent Claim
76 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having at least one region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature, and an indicator means intimately associated with said thermally responsive substance, said indicator means comprising a compound which forms a eutectic mixture with said thermally responsive substance, and said compound having a melting point higher than the highest melting thermally responsive substance.
Claim 3
Dependent Claim
29 words
Temperature indicator as in claim 1 wherein said thermally responsive substance is a solid solution of ortho-chloronitrobenzene and ortho-bromonitrobenzene and the compound in said indicator means is dibenzyl succinate.
Claim 4
Dependent Claim
98 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having a plurality of spaced regions, each region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature different from the thermally responsive substance in any other region, and indicator means associated with the thermally responsive substance in each of said regions, said indicator means comprising a compound which forms a eutectic with the thermally responsive substance in each of said regions, and said compound having a melting point above the highest melting thermally responsive substance in said regions.
Claim 5
Dependent Claim
98 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion having a plurality of spaced regions, each region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature different from the thermally responsive substance in any other region, and indicator means associated with the thermally responsive substance in each of said regions, said indicator means comprising a compound which forms a eutectic with the thermally responsive substance in each of said regions, and said compound having a melting point above the highest melting thermally responsive substance in said regions.
Claim 6
Dependent Claim
23 words
Temperature indicator as in claim 3 wherein said thermally responsive substance in each of said regions is in the form of solid solution.
Claim 7
Dependent Claim
16 words
Temperature indicator as in claim 4 wherein said solid solution is composed of ortho-chloronitrobenzene and ortho-bromonitrobenzene.
Claim 8
Dependent Claim
37 words
Temperature indicator as in claim 4 wherein said solid solution is composed of ortho-chloronitrobenzene and ortho-bromonitrobenzene and wherein the compound in said indicator means is selected from the group consisting of dibenzyl succinate, phenyl salicylate and dibenzyl.
Claim 9
Dependent Claim
16 words
Temperature indicator as in claim 6 wherein the compound in said indicator means is dibenzyl succinate.
Claim 10
Dependent Claim
122 words
Temperature indicator for measuring temperature in the clinical range comprising a carrier having a temperature indicating portion, said portion having a plurality of spaced regions, each region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature no more than about 2/10th of a Fahrenheit degree different from the temperature of change of state of the thermally responsive substance in the adjacent region, and indicator means intimately associated with the thermally responsive substance in each of said regions, said indicator means comprising a compound which forms a eutectic with the thermally responsive substance in each of said regions, and said compound having a melting point above the highest melting thermally responsive substance in said regions.
Claim 11
Dependent Claim
122 words
Temperature indicator for measuring temperature in the clinical range comprising a carrier having a temperature indicating portion, said portion having a plurality of spaced regions, each region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature no more than about 2/10th of a Fahrenheit degree different from the temperature of change of state of the thermally responsive substance in the adjacent region, and indicator means intimately associated with the thermally responsive substance in each of said regions, said indicator means comprising a compound which forms a eutectic with the thermally responsive substance in each of said regions, and said compound having a melting point above the highest melting thermally responsive substance in said regions.
Claim 12
Dependent Claim
23 words
Temperature indicator as in claim 8 wherein the thermally responsive substance in each of said regions is in the form of solid solution.
Claim 13
Dependent Claim
16 words
Temperature indicator as in claim 9 wherein said solid solution is composed of ortho-chloronitrobenzene and ortho-bromonitrobenzene.
Claim 14
Dependent Claim
37 words
Temperature indicator as in claim 9 wherein said solid solution is composed of ortho-chloronitrobenzene and ortho-bromonitrobenzene, and wherein the compound in said indicator means is selected from the group consisting of dibenzyl succinate, phenyl salicylate and dibenzyl.
Claim 15
Dependent Claim
16 words
Temperature indicator as in claim 11 wherein the compound in said indicator means is dibenzyl succinate.
Claim 16
Dependent Claim
76 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion comprising a region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature and an indicator means intimately associated with said thermally responsive substance, said indicator means comprising a compound which forms a eutectic mixture with said thermally responsive substance, and said compound having a melting point higher than the melting point of said thermally responsive substance.
Claim 17
Dependent Claim
76 words
Temperature indicator comprising a carrier having a temperature indicating portion, said portion comprising a region containing a thermally responsive substance which undergoes a change of state at a precise and predetermined temperature and an indicator means intimately associated with said thermally responsive substance, said indicator means comprising a compound which forms a eutectic mixture with said thermally responsive substance, and said compound having a melting point higher than the melting point of said thermally responsive substance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |