US3718181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic heat exchange apparatus
Assignee: Ametek Inc
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Filing: 1970-08-17
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Granted: 1973-02-27
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Expires: 1990-08-17
Abstract
Abstract Hollow plastic filaments, useful in heat exchange systems, which are made from plastic compositions containing 5 to 45 percent by weight of filler particles having substantially higher thermal conductivity than the plastic and a diameter greater than 2.0 microns, will have high thermal conductivity and appreciable mechanical strength if the particles are chosen such that the ratio of the particle diameter to the wall thickness of the filament is between 0.001 and 0.5 and if the particles are dispersed within the plastic homogeneously enough to produce the desired mechanical stability and heterogeneously enough to take advantage of the high thermal conductivity of such a dispersion.
Inventors
- 👤 R Smith
- 👤 T Reilly
- 👤 C Reitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:49
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/22; F28F21/00; F28F21/06; F28F21/062; F28F2009/222; F28F2009/224; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/427
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
27 words
The heat exchanger of claim 1 wherein said plastic is a polyfluorinated plastic and said filler particles are filler particles which are substantially impervious to corrosive fluids.
Claim 2
Dependent Claim
23 words
The heat exchanger of claim 1 wherein the ratio of said diameter to the wall thickness of said filament is 0.001 to 0.1.
Claim 3
Dependent Claim
21 words
The heat exchanger of claim 1 wherein said plastic is a polyfluorinated plastic and said filler particles are carbon filler particles.
Claim 4
Dependent Claim
38 words
The heat exchanger of claim 4 wherein said polyfluorinated plastic is a polyfluorinated plastic selected from the group consisting of polymers of tetrafluoroethylene and copolymers of tetrafluoroethylene and hexafluoropropylene and said carbon filler particles are graphite filler particles.
Claim 5
Dependent Claim
45 words
The heat exchanger of claim 1 wherein said filaments comprise a plastic composition containing 5 to 25 percent by weight of said filler particles, and wherein said filaments have a thermal conductivity greater than one and a half times the thermal conductivity of the plastic.
Claim 6
Dependent Claim
21 words
The heat exchanger of claim 6 wherein said plastic is a polyfluorinated plastic and said filler particles are graphite filler particles.
Claim 7
Dependent Claim
18 words
The heat exchanger of claim 7 wherein said filler particles have a diameter of 2.0 to 50 microns.
Claim 8
Dependent Claim
46 words
The heat exchanger of claim 1 wherein said filaments comprise a plastic composition containing 10 to 20 percent by weight of said filler particles, and wherein said filaments have a thermal conductivity of greater than one and a half times the thermal conductivity of tHe plastic.
Claim 9
Dependent Claim
29 words
The heat exchanger of claim 9 wherein said plastic is a polyfluorinated plastic and said filler particles are graphite filler particles having a diameter of 2.0 to 50 microns.
Claim 10
Dependent Claim
29 words
The heat exchanger of claim 10 wherein said polyfluorinated plastic is a polyfluorinated plastic selected from the group consisting of polymers of tetrafluoroethylene and copolymers of tetrafluoroethylene and hexafluoropropylene.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |