Patent US4260504A successfully refreshed from Google Patents.
US4260504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxyalkylene triol additives for minimizing deposits from aqueous heat-exchanging fluids
Assignee: BP Chimie SA
•
Filing: 1979-03-22
•
Granted: 1981-04-07
•
Expires: 1999-03-22
Abstract
Abstract PCT No. PCT/FR78/00008 Sec. 371 Date Mar. 22, 1979 Sec. 102(e) Date Mar. 22, 1979 PCT Filed July 10, 1978 The invention concerns a process for preventing the formation of deposits on the walls of the heating or cooling circuits of heat exchangers in which an aqueous heat-exchange liquid circulates. This process comprises mixing with the heat-exchange liquids from about 0.3 to about 5% by weight of a product of polyaddition of ethylene oxide and propylene oxide on a monohydric alcohol, water, a diol or a triol, the ethylene oxide representing from 60% to 90% by weight of the fixed alkylene oxides. This process can be used in particular in internal combustion engine cooling circuits.
Inventors
- 👤 Marcel J. Tucoulat
- 👤 Jacques Lonchampt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:23
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C09; C09K; C09K5/00; C09K5/20; C23; C23F; C23F14/00; C23F14/02; C23F15/00; C23F15/005; F; F01; F01P; F01P11/00; F01P11/06; C02F2103/00; C02F2103/02; C02F2103/023; F01P3/00; F01P2003/001; F01P2011/063; F28; F28F; F28F19/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A process for preventing the formation of deposits on the walls of the heating or cooling circuits of heat exchangers using an aqueous heat-exchange liquid containing an anti-freeze based on a glycol, said process being characterised in that addition is made to the heat-exchange liquid of from about 0.3 to about 5% by weight of a product of polyaddition of ethylene oxide and propylene oxide on a triol, the ethylene oxide representing from 60% to 90% by weight of the fixed alkylene oxides, the mean molecular weight of the product of polyaddition of ethylene oxide and propylene oxide on a triol being from 500 to 4,000.
Claim 2
Dependent Claim
106 words
A process for preventing the formation of deposits on the walls of the heating or cooling circuits of heat exchangers using an aqueous heat-exchange liquid containing an anti-freeze based on a glycol, said process being characterised in that addition is made to the heat-exchange liquid of from about 0.3 to about 5% by weight of a product of polyaddition of ethylene oxide and propylene oxide on a triol, the ethylene oxide representing from 60% to 90% by weight of the fixed alkylene oxides, the mean molecular weight of the product of polyaddition of ethylene oxide and propylene oxide on a triol being from 500 to 4,000.
Claim 3
Dependent Claim
30 words
A process as claimed in 1 wherein the ethylene oxide and propylene oxide polyaddition product is produced by reaction of a mixture of said two alkylene oxides on a triol.
Claim 4
Dependent Claim
43 words
A process as claimed in 1 wherein the product of polyaddition of ethylene oxide and propylene oxide on a triol is first added to the anti-freeze in a proportion of from 1 to 15% by weight, before the anti-freeze is mixed with water.
Claim 5
Dependent Claim
14 words
A process as claimed in 1 wherein the heat-exchange liquid contains corrosion inhibiting agents.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1 in which the glycol is selected from the group consisting of ethyleneglycol and propyleneglycol.
Claim 7
Dependent Claim
48 words
As a novel industrial product, a heat exchange liquid composition comprising an aqueous solution containing from about 0.3 to about 5% by weight of the polyaddition product as defined in claim 1, 1 to 15% by weight of an anti-freeze based on a glycol, and corrosion inhibiting agents.
Claim 8
Dependent Claim
21 words
A product as claimed in claim 6 in which the glycol is selected from the group consisting of ethyleneglycol and propyleneglycol.
References Cited (Backward Citations)
US2425755A
Cited
US2425845A
Cited
US2602780A
Cited
US2733272A
Cited
US2757142A
Cited
US2657181A
Cited
US2831034A
Cited
US2948757A
Cited
US3578589A
Cited
US3666404A
Cited
US3962119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |