Patent US3961530A successfully refreshed from Google Patents.
US3961530A
Expired / Lapsed
US
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Method and thermometer for measuring temperature by determination of saturation of a solvent having temperature dependent characteristics
Assignee: Arbman Development AB
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Filing: 1974-10-24
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Granted: 1976-06-08
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Expires: 1994-10-24
Abstract
Abstract The thermometer of the invention is characterized by a substance, preferably a salt, the solubility of which changes with temperature and which is present in a solid or liquid phase in the temperature range in which the thermometer is intended to be used, said substance being extended in a space such as a column or the like one end of which space is arranged to be brought into contact with a specified quantity of a liquid solvent for said substance. Measurement of temperature is performed by observing how much of the substance will be dissolved before saturation of the liquid solvent.
Inventors
- 👤 Claes Ivar Helgesson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:50
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06; G01K11/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
93 words
A method for determining a temperature within a predetermined temperature range comprising contacting a solute in columnar form with a solvent therefor at one end thereof while being subjected to the temperature to be determined, said solvent being unsaturated with solute at the temperature within said predetermined temperature range and the amount of said solute soluble in said solvent varying in accordance with the temperature thereof, and determining the amount of solute progressively dissolved in said solvent when saturated with solute after contacting the solute with said solvent, to determine the temperature thereof.
Claim 2
Independent Claim
93 words
A method for determining a temperature within a predetermined temperature range comprising contacting a solute in columnar form with a solvent therefor at one end thereof while being subjected to the temperature to be determined, said solvent being unsaturated with solute at the temperature within said predetermined temperature range and the amount of said solute soluble in said solvent varying in accordance with the temperature thereof, and determining the amount of solute progressively dissolved in said solvent when saturated with solute after contacting the solute with said solvent, to determine the temperature thereof.
Claim 3
Dependent Claim
13 words
A method as claimed in claim 1 wherein said solute is a salt.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 1 wherein said solvent, prior to contacting said solute, contains a quantity of said solute insufficient to saturate said solvent at temperatures within said predetermined temperature range.
Claim 5
Dependent Claim
28 words
A method as claimed in claim 1 wherein said solvent is saturated with said solute at a temperature just below the lowest temperature of said predetermined temperature range.
Claim 6
Dependent Claim
133 words
A thermometer for measuring temperature within a predetermined temperature range comprising a columnar means containing a soluble substance, frangible means containing a specified quantity of a solvent for said soluble substance and disposed at one end of said columnar means, said frangible means normally separating said soluble substance from said solvent, and a temperature scale associated with said columnar means, said solvent and soluble substance having solubility characteristics which change with temperature and said solvent being unsaturated with the soluble substance at temperatures within said predetermined temperature range whereby when said frangible means is broken said solvent progressively dissolves the soluble substance in said columnar means until the solvent becomes saturated with the soluble substance and the extent to which said soluble substance is dissolved indicating the existing temperature on said temperature scale.
Claim 7
Dependent Claim
133 words
A thermometer for measuring temperature within a predetermined temperature range comprising a columnar means containing a soluble substance, frangible means containing a specified quantity of a solvent for said soluble substance and disposed at one end of said columnar means, said frangible means normally separating said soluble substance from said solvent, and a temperature scale associated with said columnar means, said solvent and soluble substance having solubility characteristics which change with temperature and said solvent being unsaturated with the soluble substance at temperatures within said predetermined temperature range whereby when said frangible means is broken said solvent progressively dissolves the soluble substance in said columnar means until the solvent becomes saturated with the soluble substance and the extent to which said soluble substance is dissolved indicating the existing temperature on said temperature scale.
Claim 8
Dependent Claim
18 words
A thermometer as claimed in claim 5 wherein said columnar means comprises a capillary means of transparent material.
Claim 9
Dependent Claim
23 words
A thermometer as claimed in claim 5 wherein said columnar means comprises an elongated strip of porous material impregnated with said soluble substance.
Claim 10
Dependent Claim
23 words
A thermometer as claimed in claim 7 wherein said frangible means is attached to one end of said elongated strip of porous material.
Claim 11
Dependent Claim
17 words
A thermometer as claimed in claim 7 wherein said elongated strip of porous material has hydrophobic characteristics.
Claim 12
Dependent Claim
24 words
A thermometer as claimed in claim 5 wherein said columnar means comprises an elongated strip of material having a coating of said soluble substance.
Claim 13
Dependent Claim
87 words
A thermometer as claimed in claim 5 wherein said frangible means includes two compartments, one containing the solvent and the other containing a quantity of the soluble substance which will saturate said solvent at a temperature below said predetermined temperature range, and said frangible means further including a frangible barrier between the two compartments so that when said frangible barrier is broken said solvent may dissolve the soluble substance in said second compartment before breaking said frangible means for measuring the temperature in the predetermined temperature range.
Claim 14
Dependent Claim
16 words
A thermometer as claimed in claim 5 wherein said solvent contains an agent for reducing wetting.
Claim 15
Dependent Claim
25 words
A thermometer as claimed in claim 5 wherein a color indicator is added to said soluble substance which changes color when dissolved in said solvent.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |