US3899918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential microcalorimeter
Assignee: Individual
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Filing: 1973-03-05
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Granted: 1975-08-19
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Expires: 1993-03-05
Abstract
Abstract A differential microcalorimeter is provided with a shield which encloses the sample and reference calorimetric chambers with thermal sensing and heating elements secured on the surfaces of the chambers and connected electrically with thermoregulators and at least one heat shunt provided in relation to the sample and reference calorimetric chambers so that it isolates the working volumes of the chambers. The above heat shunt is provided with a thermoregulator coupled electrically with it and with one of the above calorimetric chambers. The sample and reference calorimetric chambers are fashioned as capillary tubes having inlets and outlets which are outside the shield of the calorimetric unit.
Inventors
- 👤 Petr Leonidovich Privalov
- 👤 Pavel Semenovich Makurin
- 👤 Valerian Valerievich Plotnikov
- 👤 Vladimir Vasilievich Koryagin
- 👤 Viktor Sergeevich Polpudnikov
- 👤 Georgy Pavlovich Stepanjuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:54
CPC Classifications
G; G01; G01K; G01K17/00; G01N; G01N25/00; G01N25/20; G01N25/48; G01N25/4846; G01N25/4866
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
401 words
A differential microcalorimeter comprising: a calorimetric unit including a shield; a sample calorimetric chamber provided with a heating element and a heat sensing element, and made as a capillary tube inserted inside said shield so that the inlet and outlet of said capillary tube, through which said chamber is respectively filled and emptied are located outside said shield; a reference calorimetric chamber provided with a heating element and a heat sensing element, and made as a capillary tube inserted inside said shield so that the inlet and outlet of said capillary tube, through which said chamber is respectively filled and emptied, are located outside said shield; at least one heat shunt comprising an element made of a material having a high heat conductivity and having a heater, said capillary tubes extending through said shunt and having good thermal contact therewith, each of said capillary tubes being divided by said shunt into a non-working portion extending beyond the shunt to form said inlets and outlets of said capillary tubes through which each of said chambers are filled and emptied, and a working volume portion that is not enclosed by said shunt and is a continuation of said non-working portion, said heating element and said heat sensing element of each calorimetric chamber being disposed on the surface of its respective said working volume portion; a heat sensing element of said heat shunt; a heat sensing element of said shield; a heating element of said shield; a first thermoregulator with two inputs and one output, said inputs being connected to at least one of said heat sensing elements of said calorimetric chambers and to said heat sensing element of said shield, and the output being connected to said heating element of said shield; a second thermoregulator with two inputs and one output, one of the inputs being connected to the same heat sensing elements of said calorimetric chambers as the first thermoregulator, the other input being connected to said heat sensing element of said heat shunt, and the output being connected to said heating element of said heat shunt; a third thermoregulator with two inputs and three outputs, said inputs being connected to the respective heat sensing elements of said chambers, and two of said three outputs being connected to said heating elements of said chambers, and a recorder connected to said third output of said third thermoregulator for recording the results of measurements.
Claim 2
Dependent Claim
401 words
A differential microcalorimeter comprising: a calorimetric unit including a shield; a sample calorimetric chamber provided with a heating element and a heat sensing element, and made as a capillary tube inserted inside said shield so that the inlet and outlet of said capillary tube, through which said chamber is respectively filled and emptied are located outside said shield; a reference calorimetric chamber provided with a heating element and a heat sensing element, and made as a capillary tube inserted inside said shield so that the inlet and outlet of said capillary tube, through which said chamber is respectively filled and emptied, are located outside said shield; at least one heat shunt comprising an element made of a material having a high heat conductivity and having a heater, said capillary tubes extending through said shunt and having good thermal contact therewith, each of said capillary tubes being divided by said shunt into a non-working portion extending beyond the shunt to form said inlets and outlets of said capillary tubes through which each of said chambers are filled and emptied, and a working volume portion that is not enclosed by said shunt and is a continuation of said non-working portion, said heating element and said heat sensing element of each calorimetric chamber being disposed on the surface of its respective said working volume portion; a heat sensing element of said heat shunt; a heat sensing element of said shield; a heating element of said shield; a first thermoregulator with two inputs and one output, said inputs being connected to at least one of said heat sensing elements of said calorimetric chambers and to said heat sensing element of said shield, and the output being connected to said heating element of said shield; a second thermoregulator with two inputs and one output, one of the inputs being connected to the same heat sensing elements of said calorimetric chambers as the first thermoregulator, the other input being connected to said heat sensing element of said heat shunt, and the output being connected to said heating element of said heat shunt; a third thermoregulator with two inputs and three outputs, said inputs being connected to the respective heat sensing elements of said chambers, and two of said three outputs being connected to said heating elements of said chambers, and a recorder connected to said third output of said third thermoregulator for recording the results of measurements.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |