US3749879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for providing controlled temperature ambient
Assignee: Texas Instruments Inc
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Filing: 1971-12-27
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Granted: 1973-07-31
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Expires: 1991-12-27
Abstract
Abstract Apparatus is disclosed fo providing a controlled temperature ambient for temperature sensitive devices comprising an electrically and thermally insulative housing in which is mounted one within the other, first and second heat transfer members spaced from each other and from the housing. The heat transfer members sandwich therebetween self-regulating heating elements and serve as electrical terminals for the heating elements, the inner member being adapted to receive a temperature sensitive device therein.
Inventors
- 👤 J Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:42
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/0014; G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2401
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
159 words
Apparatus for maintaining a relatively constant ambient temperature in an enclosure comprising: an outer housing of thermally insulative material formed with a cavity therein and having terminal apertures extending from outside the outer housing into the cavity; a first heat transfer member comprising a thermally conductive liner located in the cavity, the liner essentially enveloping a predetermined area; means mounting the liner in the outer housing and maintaining the liner in spaced Relation therewith; a second heat transfer member comprising a thermally conductive component receiving case member positioned within the liner envelope; electrical resistor pill means sandwiched between the first and second heat transfer members, the pill means maintaining the first and second heat transfer members in spaced relation with each other and occupying less volume than the entire space therebetween; and means to apply a voltage to the electrical resistor means including terminals extending through the terminal apertures, the terminals providing electrical connection to the resistor pill means.
Claim 2
Dependent Claim
159 words
Apparatus for maintaining a relatively constant ambient temperature in an enclosure comprising: an outer housing of thermally insulative material formed with a cavity therein and having terminal apertures extending from outside the outer housing into the cavity; a first heat transfer member comprising a thermally conductive liner located in the cavity, the liner essentially enveloping a predetermined area; means mounting the liner in the outer housing and maintaining the liner in spaced Relation therewith; a second heat transfer member comprising a thermally conductive component receiving case member positioned within the liner envelope; electrical resistor pill means sandwiched between the first and second heat transfer members, the pill means maintaining the first and second heat transfer members in spaced relation with each other and occupying less volume than the entire space therebetween; and means to apply a voltage to the electrical resistor means including terminals extending through the terminal apertures, the terminals providing electrical connection to the resistor pill means.
Claim 3
Dependent Claim
34 words
Apparatus according to claim 1 in which the electrical resistor pill means extends along only a portion of the facing surfaces of the liner and the case member in the direction of their peripheries.
Claim 4
Dependent Claim
23 words
Apparatus according to claim 1 in which the electrical resistor pill means comprises material having a steeply sloped positive temperature coefficient of resistivity.
Claim 5
Dependent Claim
62 words
Apparatus according to claim 1 in which the case member is generally elliptical as seen in a top view and has a flat surface area and the liner has a flat surface area aligned with the flat surface area of the case member and the electrical resistor pill means comprises a pill having two parallel surfaces bonded to respective flat surface areas.
Claim 6
Dependent Claim
71 words
Apparatus according to claim 1 in which the case member has two flat surface areas disposed on opposite sides of the case, and the liner has two flat surface areas disposed on opposite sides of the liner in alignment with respective flat surface areas of the case member, and the electrical resistor pill means comprises two pills, each having two parallel surfaces, each surface bonded to a respective flat surface area.
Claim 7
Dependent Claim
24 words
Apparatus according to claim 5 in which the pills are electrically connected to the flat surface areas by electrically and thermally conductive epoxy material.
Claim 8
Dependent Claim
17 words
Apparatus according to claim 6 in which the pills comprise steeply-sloped positive temperature coefficient of resistivity material.
Claim 9
Dependent Claim
25 words
Apparatus according to claim 7 in which the material is a ceramic like material having a flame sprayed layer of aluminum on the parallel surfaces.
Claim 10
Dependent Claim
169 words
Apparatus for maintaining a relatively constant temperature in an enclosure comprising: an outer housing in the form of a cup-shaped member having a first closed end, a depending wall and a second open end, and a cover received in the open end to enclose a cavity within the housing, the cup-shaped member and the cover formed of electrically and thermally insulative material, and a plurality of ribs formed in the depending wall; an electrically and thermally conductive liner located in the cavity and spaced from the depending wall by the ribs, the liner having a terminal extending therefrom; an electrically and thermally conductive component receiving case member located within the liner and spaced therefrom, the case member having a terminal extending therefrom; electrical heating means comprising at least one pill of ceramic like material, the pill sandwiched between the liner and the case member; electrically and thermally conductive epoxy bonding the pill to the liner and the case member; and the housing defining apertures through which the terminals extend.
Claim 11
Dependent Claim
169 words
Apparatus for maintaining a relatively constant temperature in an enclosure comprising: an outer housing in the form of a cup-shaped member having a first closed end, a depending wall and a second open end, and a cover received in the open end to enclose a cavity within the housing, the cup-shaped member and the cover formed of electrically and thermally insulative material, and a plurality of ribs formed in the depending wall; an electrically and thermally conductive liner located in the cavity and spaced from the depending wall by the ribs, the liner having a terminal extending therefrom; an electrically and thermally conductive component receiving case member located within the liner and spaced therefrom, the case member having a terminal extending therefrom; electrical heating means comprising at least one pill of ceramic like material, the pill sandwiched between the liner and the case member; electrically and thermally conductive epoxy bonding the pill to the liner and the case member; and the housing defining apertures through which the terminals extend.
Claim 12
Dependent Claim
16 words
Apparatus according to claim 9 in which the pill is comprised of a doped barium titanate.
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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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |