US5520833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for lubricating compression-type refrigerating cycle
Assignee: Idemitsu Kosan Co Ltd
•
Filing: 1994-01-11
•
Granted: 1996-05-28
•
Expires: 2014-01-11
Abstract
Abstract A method for lubricating a compression-type refrigerating cycle using a substitute flon refrigerant, i.e., a method for lubricating a compression-type refrigerating cycle which has either or both of an oil separator and a hot gas line, by the use of a substitute flon refrigerant such as 1,1,1,2-tetrafluoroethane and a lubricant having a kinematic viscosity of 2 to 50 cst at 100 DEG C. and an interfacial tension of 25 dyne/cm or above and being a liquid at ordinary temperatures.
Inventors
- 👤 Masato Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
C; C10; C10M; C10M105/00; C10M105/02; C10M105/06; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C10M171/00; C10M171/008; C09K2205/00; C09K2205/24; C10M2203/00; C10M2203/06; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/06; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
113 words
A method for lubricating a compression-type refrigerating cycle comprising a compressor, a condenser, an expansion valve, an evaporator and either or both of an oil separator, and a hot gas line, which method comprises using a substitute fluorocarbon refrigerant comprising as the essential component at least one compound selected from the group consisting of 1,1,1,2-tetrafluoroethane; 1,1,2,2-tetrafluoroethane; 1,1-difluoroethane; trifluoromethane; difluoromethane; pentafluoroethane; and 1,1,1-trifluoroethane, in combination with a lubricant consisting essentially of at least one member selected from the group consisting of alkylbenzenes and alkylnaphthalenes, having a kinematic viscosity of 2 to 50 cSt at 100° C. and an interfacial tension of 30 to 80 dyne/cm or above and being a liquid at ordinary temperatures.
Claim 2
Independent Claim
113 words
A method for lubricating a compression-type refrigerating cycle comprising a compressor, a condenser, an expansion valve, an evaporator and either or both of an oil separator, and a hot gas line, which method comprises using a substitute fluorocarbon refrigerant comprising as the essential component at least one compound selected from the group consisting of 1,1,1,2-tetrafluoroethane; 1,1,2,2-tetrafluoroethane; 1,1-difluoroethane; trifluoromethane; difluoromethane; pentafluoroethane; and 1,1,1-trifluoroethane, in combination with a lubricant consisting essentially of at least one member selected from the group consisting of alkylbenzenes and alkylnaphthalenes, having a kinematic viscosity of 2 to 50 cSt at 100° C. and an interfacial tension of 30 to 80 dyne/cm or above and being a liquid at ordinary temperatures.
Claim 3
Dependent Claim
11 words
A method according to claim 1 wherein the lubricant is alkylbenzene.
Claim 4
Dependent Claim
11 words
A method according to claim 1 wherein the lubricant is alkylnaphthalene.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein the lubricant has a kinematic viscosity of 3 to 30 cSt at 100° C.
Claim 6
Dependent Claim
21 words
A method according to claim 2 wherein the lubricant has a kinematic viscosity of 3 to 30 cSt at 100° C.
Claim 7
Dependent Claim
21 words
A method according to claim 3 wherein the lubricant has a kinematic viscosity of 3 to 30 cSt at 100° C.
Claim 8
Dependent Claim
15 words
A method according to claim 1 wherein the refrigerant comprises 1,1,1,2-tetrafluoroethane as the essential component.
Claim 9
Dependent Claim
15 words
A method according to claim 1 wherein the refrigerant comprises difluoromethane as the essential component.
Claim 10
Dependent Claim
28 words
A method according to claim 1 wherein the refrigerant comprises as the essential component a mixture of 1,1,1,2-tetrafluoroethane and difluoromethane; difluoromethane and pentafluoroethane; or 1,1,1,2-tetrafluoroethane, difluoromethane and pentafluoroethane.
Claim 11
Dependent Claim
29 words
A method according to claim 1 wherein the compression-type refrigerating cycle comprises a compressor, a condenser, an expansion valve, an evaporator, an oil separator and a hot gas line.
Claim 12
Dependent Claim
25 words
A method according to claim 1 wherein the compression-type refrigerating cycle comprises a compressor, a condenser, an expansion valve, an evaporator and an oil separator.
Claim 13
Dependent Claim
26 words
A method according to claim 1 wherein the compression-type refrigerating cycle comprises a compressor, a condenser, an expansion valve, an evaporator and a hot gas line.
Claim 14
Dependent Claim
32 words
A method according to claim 2, wherein the substitute fluorocarbon refrigerant consists essentially of at least one compound selected from the group consisting of 1,1,1,2-tetrafluoroethane; 1,1,2,2-tetrafluoroethane; 1,1-difluoroethane; trifluoromethane; difluoromethane; pentafluoroethane; and 1,1,1-trifluoroethane.
Claim 15
Dependent Claim
32 words
A method according to claim 3, wherein the substitute fluorocarbon refrigerant consists essentially of at least one compound selected from the group consisting of 1,1,1,2-tetrafluoroethane; 1,1,2,2-tetrafluoroethane; 1,1-difluoroethane; trifluoromethane; difluoromethane; pentafluoroethane; and 1,1,1-trifluoroethane.
Claim 16
Independent Claim
147 words
A method for lubricating a compression-type refrigerating cycle comprising a compressor, a condenser, an expansion valve, an evaporator and either or both of an oil separator, and a hot gas line, which method comprises using a substitute fluorocarbon refrigerant comprising as the essential component at least one compound selected from the group consisting of 1,1,1,2-tetrafluoroethane; 1,1,2,2-tetrafluoroethane; 1,1-difluoroethane; trifluoromethane; difluoromethane; pentafluoroethane; and 1,1,1-trifluoroethane, in combination with a lubricant consisting essentially of at least one member selected from the group consisting of alkylbenzenes and alkylnaphthalenes, having a kinematic viscosity of 2 to 50 cSt at 100° C. and an interfacial tension of 30 to 80 dyne/cm or above and being a liquid at ordinary temperatures and at least one additive selected from the group consisting of extreme pressure agent, antioxidant, chlorine capturing agent, metal deactivator, defoaming agent, detergent-dispersant, viscosity index improver, antirust agent, corrosion inhibitor and pour point depressant.
Claim 17
Independent Claim
147 words
A method for lubricating a compression-type refrigerating cycle comprising a compressor, a condenser, an expansion valve, an evaporator and either or both of an oil separator, and a hot gas line, which method comprises using a substitute fluorocarbon refrigerant comprising as the essential component at least one compound selected from the group consisting of 1,1,1,2-tetrafluoroethane; 1,1,2,2-tetrafluoroethane; 1,1-difluoroethane; trifluoromethane; difluoromethane; pentafluoroethane; and 1,1,1-trifluoroethane, in combination with a lubricant consisting essentially of at least one member selected from the group consisting of alkylbenzenes and alkylnaphthalenes, having a kinematic viscosity of 2 to 50 cSt at 100° C. and an interfacial tension of 30 to 80 dyne/cm or above and being a liquid at ordinary temperatures and at least one additive selected from the group consisting of extreme pressure agent, antioxidant, chlorine capturing agent, metal deactivator, defoaming agent, detergent-dispersant, viscosity index improver, antirust agent, corrosion inhibitor and pour point depressant.
References Cited (Backward Citations)
US4199461A
Cited
US4758366A
Cited
US5368765A
Cited
US4916914A
Cited
US4829786A
Cited
US5154846A
Cited
US5001908A
Cited
US5417872A
Cited
US5295357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-28 | 1999-11-27 | 2000-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-28 | 2003-11-27 | 2004-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-28 | 2007-11-27 | 2008-05-28 | $7700.00 | Window Closed / Lapsed |