US4329243A
Expired / Lapsed
US
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Cavitation-inhibiting, nonfreezing, cooling and/or heat-transfer fluids
Assignee: Huels AG
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Filing: 1980-10-20
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Granted: 1982-05-11
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Expires: 2000-10-20
Abstract
Abstract A Cavitation-inhibiting, nonfreezing, cooling and/or heat-transfer liquid, comprising a glycol and a cavitation inhibiting effective amount of at least one phosphonic acid of the formula H.sub.2 O.sub.3 P--R--PO.sub.3 H.sub.2 wherein R is phenylene or C 1--6 -alkylene each optionally substituted by hydroxy, amino or PO 3 H 2 groups, or of the formula ##STR1## wherein R 1 , R 2 , and R 3 each independently is a C 1--4 -alkylene group or such a group whose carbon atom chain contains one or more N atoms each of which is attached to one or two groups of the formulae R 1 --PO 3 H 2 , R 2 --PO 3 H 2 or R 3 --PO 3 H 2 as defined above.
Inventors
- 👤 Klaus Diebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:16
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C09; C09K; C09K5/00; C09K5/20; C23F11/18; C23F11/181; C23F11/182; C23F11/187
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
A cavitation-inhibiting, nonfreezing, cooling and/or heat-transfer liquid, consisting essentially of water, a glycol, a cavitation inhibiting effective amount of at least one phosphonic acid of the formula H.sub.2 O.sub.3 P--R--PO.sub.3 H.sub.2 wherein R is phenylene, C 1-6 -alkylene, or phenylene or C 1-6 -alkylene substituted by hydroxy, amino or PO 3 H 2 groups, or of the formula, ##STR3## wherein R 1 , R 2 , and R 3 each independently is a C 1-4 -alkylene group or such a group whose carbon atom chain contains one or more N atoms each of which is attached to one or two groups of the formulae R 1 --PO 3 H 2 , R 2 --PO 3 H 2 or R 3 --PO 3 H 2 as defined above, and a corrosion inhibitor which is sodium benzoate, borax, sodium nitrite, a sodium phosphate, sodium carbonate, sodium nitrate, sodium silicate or a sulfur compound.
Claim 2
Dependent Claim
151 words
A cavitation-inhibiting, nonfreezing, cooling and/or heat-transfer liquid, consisting essentially of water, a glycol, a cavitation inhibiting effective amount of at least one phosphonic acid of the formula H.sub.2 O.sub.3 P--R--PO.sub.3 H.sub.2 wherein R is phenylene, C 1-6 -alkylene, or phenylene or C 1-6 -alkylene substituted by hydroxy, amino or PO 3 H 2 groups, or of the formula, ##STR3## wherein R 1 , R 2 , and R 3 each independently is a C 1-4 -alkylene group or such a group whose carbon atom chain contains one or more N atoms each of which is attached to one or two groups of the formulae R 1 --PO 3 H 2 , R 2 --PO 3 H 2 or R 3 --PO 3 H 2 as defined above, and a corrosion inhibitor which is sodium benzoate, borax, sodium nitrite, a sodium phosphate, sodium carbonate, sodium nitrate, sodium silicate or a sulfur compound.
Claim 3
Dependent Claim
23 words
The liquid of claim 1 wherein the content of glycol is 10-60 wt % based on the total weight of water and glycol.
Claim 4
Dependent Claim
21 words
The liquid of claim 1 wherein the amount of phosphonic acid is 0.005-0.2% by weight based on the weight of glycol.
Claim 5
Dependent Claim
17 words
A liquid of claim 3, containing 0.01-0.06% by weight of the phosphonic acid on the same basis.
Claim 6
Dependent Claim
15 words
A liquid of claim 1 or 4, wherein the phosphonic acid is aminotris (methylenephosphonic acid).
Claim 7
Dependent Claim
69 words
A cavitation-inhibiting, nonfreezing, cooling and/or heat-transfer liquid, comprising water, a glycol and a cavitation inhibiting effective amount of at least one phosphonic acid of the formula H.sub.2 O.sub.3 P--R--PO.sub.3 H.sub.2 wherein R is phenylene or phenylene substituted by hydroxy, amino or PO 3 H 2 groups, or of the formula, ##STR4## wherein R 1 , R 2 , and R 3 each independently is a C 1-4 -alkylene group.
Claim 8
Dependent Claim
69 words
A cavitation-inhibiting, nonfreezing, cooling and/or heat-transfer liquid, comprising water, a glycol and a cavitation inhibiting effective amount of at least one phosphonic acid of the formula H.sub.2 O.sub.3 P--R--PO.sub.3 H.sub.2 wherein R is phenylene or phenylene substituted by hydroxy, amino or PO 3 H 2 groups, or of the formula, ##STR4## wherein R 1 , R 2 , and R 3 each independently is a C 1-4 -alkylene group.
Claim 9
Dependent Claim
24 words
A method of cooling or of heat-transfer comprising circulating a liquid cooling or heat-transfer medium, wherein the liquid medium is that of claim 1.
Claim 10
Dependent Claim
24 words
A method of cooling or of heat-transfer comprising circulating a liquid cooling or heat-transfer medium, wherein the liquid medium is that of claim 2.
Claim 11
Independent Claim
81 words
A method of inhibiting cavitation in a metal in contact with a nonfreezing, cooling and/or heat transfer liquid which comprises including in the liquid a cavitation inhibiting effective amount of at least one phosphonic acid of the formula H.sub.2 O.sub.3 P--R--PO.sub.3 H.sub.2 wherein R is phenylene or phenylene substituted by hydroxy, amino or PO 3 H 2 groups, or of the formula, ##STR5## wherein R 1 , R 2 , and R 3 each independently is a C 1-4 -alkylene group.
Claim 12
Independent Claim
81 words
A method of inhibiting cavitation in a metal in contact with a nonfreezing, cooling and/or heat transfer liquid which comprises including in the liquid a cavitation inhibiting effective amount of at least one phosphonic acid of the formula H.sub.2 O.sub.3 P--R--PO.sub.3 H.sub.2 wherein R is phenylene or phenylene substituted by hydroxy, amino or PO 3 H 2 groups, or of the formula, ##STR5## wherein R 1 , R 2 , and R 3 each independently is a C 1-4 -alkylene group.
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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) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |