Patent US3765243A successfully refreshed from Google Patents.
US3765243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature indicator
Assignee: Pymah Corp
•
Filing: 1972-08-02
•
Granted: 1973-10-16
•
Expires: 1992-08-02
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
- 👤 C Pickett
- 👤 D Chadha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:36
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
69 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 reacts exothermically with said thermally responsive substance upon change of state of the said thermally responsive substance.
Claim 2
Dependent Claim
69 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 reacts exothermically with said thermally responsive substance upon change of state of the said thermally responsive substance.
Claim 3
Dependent Claim
17 words
Temperature indicator as in claim 1 wherein said indicator means also comprises a dye or a pigment.
Claim 4
Dependent Claim
80 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 reacts exothermically with the thermally responsive substances in each oF said regions.
Claim 5
Dependent Claim
80 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 reacts exothermically with the thermally responsive substances in each oF said regions.
Claim 6
Dependent Claim
23 words
Temperature indicator as in claim 3 wherein the thermally responsive substance in each of said regions is in the form of solid solution.
Claim 7
Dependent Claim
17 words
Temperature indicator as in claim 3 wherein said indicator means also comprises a dye or a pigment.
Claim 8
Dependent Claim
17 words
Temperature indicator as in claim 4 wherein said indicator means also comprises a dye or a pigment.
Claim 9
Dependent Claim
104 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 two-tenths 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 reacts exothermically with the thermally responsive substance in each of said regions.
Claim 10
Dependent Claim
104 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 two-tenths 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 reacts exothermically with the thermally responsive substance in each of said regions.
Claim 11
Dependent Claim
23 words
Temperature indicator as in claim 4 wherein the thermally responsive substance in each of said regions is in the form of solid solution.
Claim 12
Dependent Claim
26 words
Temperature indicator as in claim 8 wherein said solution is composed of fatty acids and wherein the compound in said indicator means is an alkaline compound.
Claim 13
Dependent Claim
17 words
Temperature indicator as in claim 9 wherein said indicator means also comprises a dye or a pigment.
Claim 14
Dependent Claim
16 words
Temperature indicator as in claim 8 wherein said solid solution is composed of ortho-chloronitrobenzene and ortho-bromonitrobenzene.
Claim 15
Dependent Claim
16 words
Temperature indicator as in claim 11 wherein said indicator means also comprises a dye or pigment.
Claim 16
Dependent Claim
17 words
Temperature indicator as in claim 8 wherein said indicator means also comprises a dye or a pigment.
Claim 17
Dependent Claim
17 words
Temperature indicator as in claim 7 wherein said indicator means also comprises a dye or a pigment.
References Cited (Backward Citations)
US3430491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |