US3665762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calorimeter
Assignee: United States Department of Health and Human Services
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Filing: 1969-11-04
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Granted: 1972-05-30
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Expires: 1989-11-04
Abstract
Abstract A heat loss compensated calorimeter wherein a core is surrounded by a jacket and the jacket is surrounded by a constant temperature, adiabatic or floating shield. The core and jacket have the same heat capacities, and thermistors having the same temperature coefficients are embedded in the core and jacket to compare the heat present, by means of a Wheatstone Bridge.
Inventors
- 👤 Steve R Domen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:51
CPC Classifications
G; G01; G01K; G01K17/00; G01K17/04; G01T; G01T1/00; G01T1/02; G01T1/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
A calorimeter comprising an internal body of given heat capacity for absorbing radiation energy from a sample; a jacket surrounding said body and having the same heat capacity as said body; a shield surrounding said jacket; cavities between the body and the jacket, and between the jacket and the shield; first temperature responsive means imbedded in said body; second temperature responsive means imbedded in said jacket; and means to sum the outputs of said temperature responsive means.
Claim 2
Dependent Claim
77 words
A calorimeter comprising an internal body of given heat capacity for absorbing radiation energy from a sample; a jacket surrounding said body and having the same heat capacity as said body; a shield surrounding said jacket; cavities between the body and the jacket, and between the jacket and the shield; first temperature responsive means imbedded in said body; second temperature responsive means imbedded in said jacket; and means to sum the outputs of said temperature responsive means.
Claim 3
Dependent Claim
20 words
The device of claim 1 wherein said body, said jacket and said shield are all made of the same material.
Claim 4
Dependent Claim
44 words
The device of claim 2 wherein said body comprises a core for absorbing samples to be tested; said cavities define zones of insulating vacuum; said core comprises calibrating means imbedded therein; and further comprising temperature responsive means and heater means imbedded in said shield.
Claim 5
Dependent Claim
15 words
The device of claim 3 wherein the first and second temperature responsive means are thermistors.
Claim 6
Dependent Claim
12 words
The device of claim 4 wherein said thermistOrs have equal temperature coefficients.
Claim 7
Dependent Claim
25 words
The device of claim 5 wherein said calibrating means consist of a heating element that is a miniature thermistor for inserting energy into said core.
Claim 8
Dependent Claim
16 words
The device of claim 6 wherein said shield is a constant temperature, adiabatic, or floating shield.
Claim 9
Dependent Claim
17 words
The device of claim 7 wherein said core, said jacket, and said shield are formed of graphite.
Claim 10
Dependent Claim
36 words
The device of claim 8 wherein the heat capacity of the jacket base and the heat capacity of the jacket cap are constructed to be in the same ratio that they receive heat from the core.
Claim 11
Dependent Claim
29 words
The device of claim 9 wherein the leads from the heater are of sufficient length to radiate their excess heat in the void between the core and the jacket.
References Cited (Backward Citations)
US3394258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |