US4617984A
Expired / Lapsed
US
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Method of indirect liquid-phase heat transfer
Assignee: Union Carbide Corp
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Filing: 1985-06-28
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Granted: 1986-10-21
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Expires: 2005-06-28
Abstract
Abstract A method of indirect liquid phase heat transfer utilizing as a heat transfer fluid a composition comprising polytetra(methylene oxide) or poly(trimethylene oxide) homopolymers having molecular weights of from about 300 to about 1,000.
Inventors
- 👤 Ronald H. Harding
- 👤 George E. Totten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:15
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
A method of liquid phase heat transfer which comprises continuously circulating between a heat generating and a heat using source a substantially anhydrous polymer of the formula: ##STR2## wherein R and R' are independently hydrogen or a C 1 to C 4 aliphatic alkyl; x is an integer having a value of 3 or 4; and y is a sufficiently large integer to provide the polymer with a molecular weight of from about 300 to about 1,000.
Claim 2
Independent Claim
77 words
A method of liquid phase heat transfer which comprises continuously circulating between a heat generating and a heat using source a substantially anhydrous polymer of the formula: ##STR2## wherein R and R' are independently hydrogen or a C 1 to C 4 aliphatic alkyl; x is an integer having a value of 3 or 4; and y is a sufficiently large integer to provide the polymer with a molecular weight of from about 300 to about 1,000.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein a stabilizer capable of reducing the rate of thermal degradation of the polymer is also present.
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein the stabilizer is present in an amount of from about 0.1 to about 10 weight percent based on the weight of the polymer.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein the stabilizer is selected from the group consisting of N,N'-diphenyl-phenylene diamine, phenothiazine, propyl gallate and 3,7-dioctyl phenothiazine.
Claim 6
Dependent Claim
22 words
The method of claim 4 wherein the stabilizer comprises a combination of phenothiazine or 3,7-dioctyl phenothiazine, and at least one other stabilizer.
Claim 7
Dependent Claim
38 words
The method of claim 5 wherein x is 4 and y is a sufficiently large integer to provide the polymer with a molecular weight of from about 300 to about 700 and R and R' are methyl groups.
Claim 8
Dependent Claim
21 words
The method of claim 6 wherein the polymer has an SUS viscosity at 100° F. of less than about 100 centistokes.
Claim 9
Independent Claim
127 words
A method of liquid phase heat transfer which comprises continuously circulating between a heat generating and a heat using source a composition comprising (a) a substantially anhydrous polymer of the formula: ##STR3## wherein R and R' are independently hydrogen or a C 1 to C 4 aliphatic alkyl; x is an integer having a value of 3 or 4; and y is a sufficiently large integer to provide the polymer with a molecular weight of from about 300 to about 1,000, and (b) a sufficient amount of at least one stabilizer to provide (i) a viscosity loss or (ii) a viscosity gain of less than about 30%, after approximately 500 hours of continuous use at a temperature of about 550° F. as per the Thermal Stability Test.
Claim 10
Independent Claim
127 words
A method of liquid phase heat transfer which comprises continuously circulating between a heat generating and a heat using source a composition comprising (a) a substantially anhydrous polymer of the formula: ##STR3## wherein R and R' are independently hydrogen or a C 1 to C 4 aliphatic alkyl; x is an integer having a value of 3 or 4; and y is a sufficiently large integer to provide the polymer with a molecular weight of from about 300 to about 1,000, and (b) a sufficient amount of at least one stabilizer to provide (i) a viscosity loss or (ii) a viscosity gain of less than about 30%, after approximately 500 hours of continuous use at a temperature of about 550° F. as per the Thermal Stability Test.
Claim 11
Dependent Claim
21 words
The method of claim 8 wherein the stabilizer is selected from the group consisting of phenothiazine, 3,7-dioctyl-phenothiazine, N,N'-diphenylenediamine and propyl gallate.
Claim 12
Dependent Claim
19 words
The method of claim 8 wherein the stabilizer comprises phenothiazine or 3,7-dioctyl phenothiazine, and at least one other stabilizer.
Claim 13
Dependent Claim
11 words
The method of claim 10 wherein the other stabilizer is N,N'-diphenylenediamine.
Claim 14
Dependent Claim
35 words
The method of claim 8 wherein after 500 hours of continuous use as a heat transfer fluid at a temperature of about 550° F. no more than slight amounts of varnishes and/or sludges are produced.
Claim 15
Dependent Claim
21 words
The method of claim 8 wherein the polymer has an SUS viscosity at 100° F. of less than about 100 centistokes.
References Cited (Backward Citations)
US2448664A
Cited
US2425845A
Cited
US2677700A
Cited
US2665312A
Cited
US2786080A
Cited
US3185735A
Cited
US3324035A
Cited
US3425999A
Cited
JPS5431459A
Cited
US4259405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |