US3753369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording of reciprocal of temperature
Assignee: Monsanto Co
•
Filing: 1970-12-28
•
Granted: 1973-08-21
•
Expires: 1990-12-28
Abstract
Abstract Direct recording of the relationship between a measured property and the reciprocal of absolute temperature is afforded in viscosity and vapor pressure measurements by means of resistance thermometry in cooperation with a bridge circuit.
Inventors
- 👤 L Fowler
- 👤 W Trump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:08
CPC Classifications
G; G01; G01N; G01N7/00; G01N7/14; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/20; G01N25/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
208 words
A method for direct recording of a physical property of a substance as a substantially linear function of the reciprocal of the absolute temperature of said substance, which comprises the steps of a. exposing said substance to a determined temperature; b. sensing said physical property of said substance and obtaining a signal varying monotonically with the magnitude of said property at said determined temperature; c. applying said signal to one display input of a readout means; d. sensing the temperature of said substance with a resistance temperature transducer; e. applying the resistance of said transducer to a bridge circuit; f. applying an input voltage to said bridge circuit; g. selecting a determined resistance for the series bridge arm of said bridge circuit with respect to the resistance of said transducer so as to produce an output voltage from said bridge circuit which is a substantially linear function of the reciprocal of the absolute temperature of said substance; h. applying the output voltage from said bridge circuit to another display input of said readout means; and i. exposing said substance to further temperatures to obtain indications on said readout means sufficient to define the relationship between said physical property and the reciprocal of the absolute temperature of said substance.
Claim 2
Independent Claim
208 words
A method for direct recording of a physical property of a substance as a substantially linear function of the reciprocal of the absolute temperature of said substance, which comprises the steps of a. exposing said substance to a determined temperature; b. sensing said physical property of said substance and obtaining a signal varying monotonically with the magnitude of said property at said determined temperature; c. applying said signal to one display input of a readout means; d. sensing the temperature of said substance with a resistance temperature transducer; e. applying the resistance of said transducer to a bridge circuit; f. applying an input voltage to said bridge circuit; g. selecting a determined resistance for the series bridge arm of said bridge circuit with respect to the resistance of said transducer so as to produce an output voltage from said bridge circuit which is a substantially linear function of the reciprocal of the absolute temperature of said substance; h. applying the output voltage from said bridge circuit to another display input of said readout means; and i. exposing said substance to further temperatures to obtain indications on said readout means sufficient to define the relationship between said physical property and the reciprocal of the absolute temperature of said substance.
Claim 3
Dependent Claim
11 words
A method of claim 1 wherein the physical property is viscosity.
Claim 4
Dependent Claim
12 words
A method of claim 1 wherein the physical property is vapor pressure.
Claim 5
Dependent Claim
12 words
A method of claim 1 wherein the physical property is decomposition rate.
Claim 6
Dependent Claim
42 words
A method of claim 1 wherein the resistance which is applied in series with the resistance of the transducer is from about 0.10 to about 0.15 times the resistance of the transducer at 0*C., the transducer being of the platinum resistance type.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |