US3732722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material holder
Assignee: Applied Biosystems Inc
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Filing: 1971-08-20
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Granted: 1973-05-15
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Expires: 1991-08-20
Abstract
Abstract A material holder for a differential scanning calorimeter includes a heater element and a sensor element, both selected to exhibit substantially the same predetermined thermal coefficient of expansion. A cylindrical member for housing the heater and sensor elements is also selected to exhibit substantially the same thermal coefficient of expansion as well as to provide structural rigidity. The cylindrical member is formed from one of the precious metals or an alloy thereof. The heater and the sensor elements are positioned within the cylindrical member by components that electrically isolate the heater element from the sensor element but thermally couple the two together, as well as by components that electrically insulate the heater and the sensor elements from each other and from the cylindrical member but thermally couple the two elements together. The positioning components are also selected to exhibit substantially the same thermal coefficient of expansion as the predetermined coefficient. Thus a plurality of components and elements are assembled in a housing so as to expand and contract substantially coextensively without rupturing. The differential scanning calorimeter may therefore be operated reliably at high temperatures.
Inventors
- 👤 S Norem
- 👤 M Oneill
- 👤 R Richmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:13
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/20; G01N25/48; G01N25/4846; G01N25/4853; G01N25/486
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
A material holder for a differential scanning calorimeter that is operated at high temperatures, comprising in combination: heater and sensor elements selected to exhibit substantially the same predetermined thermal coefficient of expansion, a substantially cylindrical cup housing including a sample support surface made of a first material that differs from the material from which said elements are made but exhibiting substantially the same thermal coefficient of expansion as said predetermined coefficient, and means for positioning said heater and sensor elements within said cup housing, said positioning means selected to exhibit substantially the same thermal coefficient of expansion as said predetermined coefficient so that the heating and cooling of said material holder causes the individual components of said holder to expand and contract substantially co-extensively so as to avoid rupturing said holder.
Claim 2
Dependent Claim
131 words
A material holder for a differential scanning calorimeter that is operated at high temperatures, comprising in combination: heater and sensor elements selected to exhibit substantially the same predetermined thermal coefficient of expansion, a substantially cylindrical cup housing including a sample support surface made of a first material that differs from the material from which said elements are made but exhibiting substantially the same thermal coefficient of expansion as said predetermined coefficient, and means for positioning said heater and sensor elements within said cup housing, said positioning means selected to exhibit substantially the same thermal coefficient of expansion as said predetermined coefficient so that the heating and cooling of said material holder causes the individual components of said holder to expand and contract substantially co-extensively so as to avoid rupturing said holder.
Claim 3
Dependent Claim
44 words
The combination in accordance with claim 1 wherein said cup housing comprises: an annulus having a plurality of crenelations, and said heater and sensor elements each include a pair of electronically conductive wires that penetrate through said crenelations to the outside of said annulus.
Claim 4
Dependent Claim
24 words
The combination in accordance with claim 2 wherein said positioning means includes isolating means for electrically isolating said heater element from said sensor element.
Claim 5
Dependent Claim
31 words
The combination in accordance with claim 3 wherein said positioning means further includes insulating means for insulating said heater element and said sensor element from each other and from said annulus.
Claim 6
Dependent Claim
37 words
The combination in accordance with claim 4 wherein said insulating means includes a first pair of insulator cloths for sandwiching said heater element therebetween, and a second pair of insulator cloths for sandwiching said sensor element therebetween.
Claim 7
Dependent Claim
27 words
The combination in accordance with claim 5 wherein each of said insulators includes a pair of tabs for insertion into said crenelations for properly positioning said insulators.
Claim 8
Dependent Claim
38 words
The combination in accordance with claim 6 wherein each of said insulators comprises an alumina woven cloth for thermally coupling said sensor element to said heater element and for electrically insulating said heater element from said sensor element.
Claim 9
Dependent Claim
45 words
The combination in accordance with claim 5 wherein said isolating means comprises an electrically and thermally conductive disc positioned intermediate said first and second pairs of insulator cloths to electrostatically shield said heater element from said sensor element but to thermally couple said elements together.
Claim 10
Dependent Claim
41 words
The combination in accordance with claim 8 wherein said positioning means further includes a pair of discs substantially identical to said intermediate disc and positioned on the top and bottom of said annulus to compress said insulators and said elements together.
Claim 11
Dependent Claim
44 words
The combination in accordance with claim 9 wherein said annulus and said discs are selected to be made of a platinum-iridium alloy and said heater and sensor elements each incLude a chip of alumina having a plurality of turns of platinum wire wound there-around.
Claim 12
Dependent Claim
111 words
A material holder for a differential scanning calorimeter that is operated at high temperatures, comprising in combination heater and sensor elements made of a non-precious material a housing member including a sample support surface made of a metal selected from a group of precious metals and alloys thereof, and means for positioning said heater and sensor elements with said member said positioning means, heater and sensor elements and said housing each selected to exhibit substantially the same thermal coefficient of expansion so that the heating and cooling of said material holder causes the individual components of said holder to expand and contract substantially coextensively so as to avoid rupturing said holder.
Claim 13
Dependent Claim
111 words
A material holder for a differential scanning calorimeter that is operated at high temperatures, comprising in combination heater and sensor elements made of a non-precious material a housing member including a sample support surface made of a metal selected from a group of precious metals and alloys thereof, and means for positioning said heater and sensor elements with said member said positioning means, heater and sensor elements and said housing each selected to exhibit substantially the same thermal coefficient of expansion so that the heating and cooling of said material holder causes the individual components of said holder to expand and contract substantially coextensively so as to avoid rupturing said holder.
Claim 14
Dependent Claim
26 words
The combination in accordance with claim 11 wherein said housing member is selected from a precious metal group consisting of platinum, palladium, gold and alloys thereof.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |