US4170564A
Expired / Lapsed
US
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Refrigerants colored for leak indication with substituted anthraquinone dyes
Assignee: Milliken Research Corp
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Filing: 1977-10-06
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Granted: 1979-10-09
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Expires: 1997-10-06
Abstract
Abstract Refrigerants, refrigeration oils and refrigerant-refrigeration oil mixtures containing a substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dyes having the structure ##STR1## wherein R is an alkylene moiety containing at least 1 carbon atom, R' is a member of the group consisting of NH 2 , OH, NCOR", OCOR" and OR" wherein R" is an alkyl moiety containing from 1 to about 18 carbon atoms, and wherein n is an integer having an average of at least about 6.
Inventors
- 👤 Ralph N. Brendle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C09K2205/00; C09K2205/10; C09K2205/12; C09K2205/122
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
111 words
A leak detecting refrigeration composition for vapor compression heat transfer systems consisting essentially of a refrigeration liquid and a minor effective amount of a substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye or mixture of such anthraquinone dyes having the structure ##STR6## wherein R is an alkylene moiety containing at least 1 carbon atom, R' is a member of the group consisting of NH 2 , OH, NCOR", OCOR", and OR" wherein R" is an alkyl moiety containing from 1 to about 18 carbon atoms, and wherein n is an integer having an average value of at least about 6, said substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye being soluble in said refrigeration liquid.
Claim 2
Dependent Claim
111 words
A leak detecting refrigeration composition for vapor compression heat transfer systems consisting essentially of a refrigeration liquid and a minor effective amount of a substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye or mixture of such anthraquinone dyes having the structure ##STR6## wherein R is an alkylene moiety containing at least 1 carbon atom, R' is a member of the group consisting of NH 2 , OH, NCOR", OCOR", and OR" wherein R" is an alkyl moiety containing from 1 to about 18 carbon atoms, and wherein n is an integer having an average value of at least about 6, said substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye being soluble in said refrigeration liquid.
Claim 3
Dependent Claim
39 words
The leak detecting refrigeration composition of claim 1 wherein said minor effective amount of said substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye is at least about 0.01 grams of said dye per 100 cc of refrigeration liquid at 77° F.
Claim 4
Dependent Claim
36 words
The leak detecting refrigeration composition of claim 2 wherein said dye is present within said composition in an amount of from about 0.15 to about 1.29 grams of said dye per 100 cc of refrigeration liquid.
Claim 5
Dependent Claim
35 words
The leak detecting refrigeration composition of claim 1 wherein said refrigeration liquid is selected from the group consisting of a fluorocarbon refrigerant, a refrigeration oil, and mixtures of said fluorocarbon refrigerant and said refrigeration oil.
Claim 6
Dependent Claim
29 words
The leak detecting refrigeration composition of claim 4 wherein said fluorocarbon refrigerant is selected from the group consisting of trichlorofluoromethane, dichlorodifluoromethane, chlorofluoromethane, 1,1,2-trichloro-1,2,2-trifluoroethane, 1,2-dichloro-1,1,2,2-tetrafluoroethane, 1,1-difluoroethane/dichlorodifluoromethane azeotrope and chloropentafluoroethane/chlorodifluoromethane azeotrope.
Claim 7
Dependent Claim
16 words
The leak detecting refrigeration composition of claim 4 wherein said refrigeration liquid is a refrigeration oil.
Claim 8
Dependent Claim
35 words
The leak detecting refrigeration composition of claim 4 wherein the refrigeration liquid is a mixture of refrigeration oil and a fluorocarbon refrigerant, and wherein the weight ratio of refrigeration oil to fluorocarbon is about 1:1.
Claim 9
Dependent Claim
50 words
The leak detecting refrigeration composition of claim 4 wherein said substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye is represented by the structure ##STR7## wherein R is an alkylene moiety containing from about 1 to about 4 carbon atoms, and n has an average value of from about 16 to about 35.
Claim 10
Dependent Claim
20 words
The leak detecting refrigeration composition of claim 8 wherein said substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye has the structure ##STR8##
Claim 11
Independent Claim
141 words
A method for detecting leaks in vapor compression heat transfer systems employing a refrigeration liquid consisting essentially of fluorocarbon refrigerants and/or refrigeration oils which comprises charging to said vapor compression heat transfer system an effective minor amount of a substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye or mixture thereof to sufficiently color the refrigeration liquid and allow one to visually detect a leak in the system due to the presence of the dye at the source of the leak, said dye having the formula ##STR9## wherein R is an alkylene moiety containing at least 1 carbon atom, R' is a member of the group consisting of NH 2 , OH, OCOR", and OR" wherein R" is an alkyl moiety containing from 1 to about 18 carbon atoms, and wherein n is an integer having an average value of at least about 6.
Claim 12
Independent Claim
141 words
A method for detecting leaks in vapor compression heat transfer systems employing a refrigeration liquid consisting essentially of fluorocarbon refrigerants and/or refrigeration oils which comprises charging to said vapor compression heat transfer system an effective minor amount of a substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye or mixture thereof to sufficiently color the refrigeration liquid and allow one to visually detect a leak in the system due to the presence of the dye at the source of the leak, said dye having the formula ##STR9## wherein R is an alkylene moiety containing at least 1 carbon atom, R' is a member of the group consisting of NH 2 , OH, OCOR", and OR" wherein R" is an alkyl moiety containing from 1 to about 18 carbon atoms, and wherein n is an integer having an average value of at least about 6.
Claim 13
Dependent Claim
90 words
The method according to claim 10 wherein said substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye is represented by the structure ##STR10## wherein R is an alkylene moiety containing from 1 to about 4 carbon atoms, n has an average value of from about 16 to about 35, and said dye is charged to the refrigeration liquid in an amount sufficient to provide a concentration of said dye in the refrigeration liquid of from about 0.01 to about 1.29 grams of said dye per 100 cc of refrigeration liquid at 77° F.
Claim 14
Dependent Claim
18 words
The method according to claim 11 wherein said substantially hydrophobic polyoxypropyleneamine substituted anthraquinone dye has the structure ##STR11##
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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |