US5484547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature heat transfer fluids
Assignee: Dow Chemical Co
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Filing: 1994-01-07
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Granted: 1996-01-16
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Expires: 2014-01-07
Abstract
Abstract A heat transfer fluid containing a glycol component and a second component selected from the group consisting of 1,3-dioxolane, 2,2-dimethyl-1,3-dioxolane, glycerol formal, solketal, and 1,3-dioxanes is disclosed. The heat transfer fluid can also optionally contain corrosion inhibitors, C 1-3 alcohols, urea, imidazole or alkali metal salts. These fluids are useful as low temperature heat transfer fluids, are stable to aqueous buffers and may be used neat or as aqueous solutions over a wide range of concentrations.
Inventors
- 👤 Abel Mendoza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:00
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; C09K3/185; C09K5/00; C09K5/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A heat transfer fluid consisting essentially of (1) from 30 to 60 weight percent of a glycol component selected from the group consisting of propylene glycol, glycerol, 1,3-butanediol, diethylene glycol and triethylene glycol; (2) from 10 to 60 weight percent of a second component selected from the group consisting of 1,3-dixolane, 2,2-dimethyl-1,3-dioxolane, glycerol formal, and solketal and 1,3-dioxanes; (3) from 0 to 50 weight percent of a third component selected form the group consisting of urea, imidazole and alkali metal salts; (4) from 0 to 30 weight percent of a C 1-3 alcohol; and (5) optionally, corrosion inhibitors in addition to any urea or alkali metal salts which may be present as part of the third component.
Claim 2
Dependent Claim
117 words
A heat transfer fluid consisting essentially of (1) from 30 to 60 weight percent of a glycol component selected from the group consisting of propylene glycol, glycerol, 1,3-butanediol, diethylene glycol and triethylene glycol; (2) from 10 to 60 weight percent of a second component selected from the group consisting of 1,3-dixolane, 2,2-dimethyl-1,3-dioxolane, glycerol formal, and solketal and 1,3-dioxanes; (3) from 0 to 50 weight percent of a third component selected form the group consisting of urea, imidazole and alkali metal salts; (4) from 0 to 30 weight percent of a C 1-3 alcohol; and (5) optionally, corrosion inhibitors in addition to any urea or alkali metal salts which may be present as part of the third component.
Claim 3
Dependent Claim
12 words
The fluid of claim 1 wherein the glycol component is propylene glycol.
Claim 4
Dependent Claim
14 words
The fluid of claim 1 wherein the third component is present and is urea.
Claim 5
Dependent Claim
16 words
The fluid of claim 1 consisting essentially of propylene glycol, 1,3-dioxane; and an alkali metal salt.
Claim 6
Dependent Claim
27 words
The fluid of claim 1 consisting essentially of propylene glycol, 1,3-dioxolane; methanol; K 2 HPO 4 ; Na 2 B 4 O 7 ; and sodium tolytriazole.
Claim 7
Dependent Claim
28 words
The fluid of claim 1 consisting essentially of propylene glycol, 1,3-dioxolane; sodium nitrate; K 2 HPO 4 ; Na 2 B 4 O 7 ; and sodium tolytriazole.
Claim 8
Dependent Claim
11 words
The fluid of claim 1 wherein the second component is 4-methyl-1,3-dioxane.
References Cited (Backward Citations)
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US4418231A
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US4448702A
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US5093018A
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US5064551A
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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) | 1999-01-15 | 1999-07-17 | 2000-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-15 | 2003-07-17 | 2004-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-15 | 2007-07-17 | 2008-01-16 | $7700.00 | Window Closed / Lapsed |