Patent US4997032A successfully refreshed from Google Patents.
US4997032A
Expired / Lapsed
US
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Thermal transfer bag
Assignee: 3M Co
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Filing: 1990-04-03
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Granted: 1991-03-05
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Expires: 2010-04-03
Abstract
Abstract A thermal transfer means comprising a flexible bag or pouch filled with a chemically inert, electrically nonconductive, nonflammable, essentially gas-free, thermally stable, thermally conductive, body of liquid comprising fluorochemical liquid. Said bag is fabricated from a flexible, durable plastic film that has low permeability to air and the fluorochemical liquid. The configuration of the bag is conformable to adapt to the geometry of the space, formed between the surface of a heat generating component or components and the surface of a heat sink, into which the bag is inserted, thereby contacting said surfaces and providing a thermal conduction path for heat generated by the heat generating component during operation from said component to the heat sink. The liquid has a boiling point such that it down not boil at the highest operating temperature of the device. Also provided is a method for making and filling the bag such that after sealing the bag is substantially gas free.
Inventors
- 👤 Richard D. Danielson
- 👤 David A. Hesselroth
- 👤 Ralph J. Stein, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:26
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/20218; H05K7/20254; G; G11; G11B; G11B33/00; G11B33/14; G11B33/1406; G11B33/1413; G11B33/1426; H05K7/2039; H05K7/20436; H05K7/20445; H05K7/20454; Y; Y10; Y10S; Y10S165/00; Y10S165/044
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A sealed, flexible, liquid-containing thermal transfer bag adapted for placement in a heat generating device between and in intimate contact with a heat generating component and a heat dissipating surface such as a cold plate or housing to conduct heat from said component to said heat dissipating surface, said bag comprising: (a) a flexible, durable, air- and flourochemical-liquid-impermeable, plastic bag having one or more compartments; and (b) thermally conductive, chemically inert, essentially gas-free, electrically nonconductive, thermally stable, body of liquid comprising flourochemical liquid filling said compartments, said liquid having a boiling point such that it does not boil at the highest operating temperature of said device and having a thermal conductive of about 0.0006 to 0.0007 W/cm°C. at 25° C.
Claim 2
Dependent Claim
120 words
A sealed, flexible, liquid-containing thermal transfer bag adapted for placement in a heat generating device between and in intimate contact with a heat generating component and a heat dissipating surface such as a cold plate or housing to conduct heat from said component to said heat dissipating surface, said bag comprising: (a) a flexible, durable, air- and flourochemical-liquid-impermeable, plastic bag having one or more compartments; and (b) thermally conductive, chemically inert, essentially gas-free, electrically nonconductive, thermally stable, body of liquid comprising flourochemical liquid filling said compartments, said liquid having a boiling point such that it does not boil at the highest operating temperature of said device and having a thermal conductive of about 0.0006 to 0.0007 W/cm°C. at 25° C.
Claim 3
Dependent Claim
28 words
A thermal transfer bag according to claim 1, wherein said body of liquid has a boiling point of at least 80° C., preferably of at least 97° C.
Claim 4
Dependent Claim
17 words
A thermal transfer bag according to claim 1, wherein said heat, generating device is an electronic device.
Claim 5
Dependent Claim
16 words
A thermal transfer bag according to claim 1, wherein said thermally conductive liquid is perfluorinated liquid.
Claim 6
Dependent Claim
32 words
A thermal transfer bag according to claim 4, wherein said perfluorinated liquid is selected from the class of perfluorinated linear, branched or cyclic alkanes, ethers, tertiary amines, and aminoethers, and mixtures thereof.
Claim 7
Dependent Claim
20 words
A thermal transfer bag according to claim 1, wherein said bag is made of a multilayer, heat sealable, thermoplastic film.
Claim 8
Dependent Claim
132 words
A sealed, flexible, liquid-containing, thermal transfer bag adapted for placement in a heat generating device between and in intimate contact with a heat generating component and a heat dissipating surface such as a cold plate or housing to conduct heat from said component to said heat dissipating surface, said bag comprising: (a) a flexible, durable, air- and flourchemical-liquid-impermeable, plastic bag having one or more compartments; and (b) thermally conductive, chemically inert, essentially gas-free, electrically nonconductive, thermally stable, body of liquid comprising flourochemical liquid filling said compartments, said liquid having a boiling point such that it does not boil at the highest operating temperature of said device; wherein said bag has an adhesive applied on its outer surface, said adhesive adapted to secure said bag in place in said cavity of said device.
Claim 9
Dependent Claim
132 words
A sealed, flexible, liquid-containing, thermal transfer bag adapted for placement in a heat generating device between and in intimate contact with a heat generating component and a heat dissipating surface such as a cold plate or housing to conduct heat from said component to said heat dissipating surface, said bag comprising: (a) a flexible, durable, air- and flourchemical-liquid-impermeable, plastic bag having one or more compartments; and (b) thermally conductive, chemically inert, essentially gas-free, electrically nonconductive, thermally stable, body of liquid comprising flourochemical liquid filling said compartments, said liquid having a boiling point such that it does not boil at the highest operating temperature of said device; wherein said bag has an adhesive applied on its outer surface, said adhesive adapted to secure said bag in place in said cavity of said device.
Claim 10
Dependent Claim
109 words
A thermal transfer bag according to claim 7, wherein said adhesive is applied in the form of a double-coated, pressure-sensitive adhesive tape, the face of the tape adhering to the bag having coated thereon a moderately to highly aggressive PSA having a 180° peel test value (as measured by PSTC No. 1 test for peel adhesion in a flat glass surface) of at least 40-60N/100 mm tape width, and the other face of the tape, having coated thereon a weakly aggressive pressure-sensitive adhesive having an 180° peel test value of about 10-30N/100 mm tape width, said weakly aggressive pressure-sensitive adhesive surface being protected with a tape liner until used.
Claim 11
Dependent Claim
32 words
A thermal transfer bag according to claim 7 wherein said plastic bag comprises a multi-layer plastic file having a polyvinylidene chloride layer sandwiched between a polyamide layer and a heat-sealable polyethylene layer.
Claim 12
Dependent Claim
25 words
A thermal transfer bag according to claim 7 wherein said fluorochemical liquid has a thermal conductivity of about 0.0006 to 0.0007 W/cm°C. at 25° C.
Claim 13
Dependent Claim
16 words
A thermal transfer bag according to claim 7 wherein said body of liquid comprises perflourinated liquid.
Claim 14
Dependent Claim
130 words
A sealed, flexible, liquid-containing, thermal transfer bag adapted for placement in a heat generating device between and in intimate contact with a heat generating component and a heat dissipating surface, such as a cold plate or housing, to conduct heat from said component to said heat dissipating surface, said bag comprising: (a) a flexible, durable, air- and flourochemical-liquid-impermeable, plastic bag having one or more compartments wherein said plastic bag comprises a multi-layer plastic film comprising a polyvinylidene chloride layer sandwiched between a polyamide layer and a heat-sealable polyethylene layer; and (b) thermally conductive, chemically inert, essentially gas-free, electrically nonconductive, thermally stable, body of liquid comprising flourochemical liquid filling said compartments, said liquid having a boiling point such that it does not boil at the highest operating temperature of said device.
Claim 15
Dependent Claim
130 words
A sealed, flexible, liquid-containing, thermal transfer bag adapted for placement in a heat generating device between and in intimate contact with a heat generating component and a heat dissipating surface, such as a cold plate or housing, to conduct heat from said component to said heat dissipating surface, said bag comprising: (a) a flexible, durable, air- and flourochemical-liquid-impermeable, plastic bag having one or more compartments wherein said plastic bag comprises a multi-layer plastic film comprising a polyvinylidene chloride layer sandwiched between a polyamide layer and a heat-sealable polyethylene layer; and (b) thermally conductive, chemically inert, essentially gas-free, electrically nonconductive, thermally stable, body of liquid comprising flourochemical liquid filling said compartments, said liquid having a boiling point such that it does not boil at the highest operating temperature of said device.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |