US4755316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration lubricants
Assignee: Honeywell International Inc
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Filing: 1987-10-23
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Granted: 1988-07-05
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Expires: 2007-10-23
Abstract
Abstract Compression refrigeration equipment using tetrafluoroethane as a working fluid employs polyoxyalkylene glycols which are at least difunctional with respect to hydroxyl groups and a molecular weight between 300 and 2000. The mixtures of the glycols with the refrigerant will be miscible in the range from -40° C. to at least + 20° C.
Inventors
- 👤 Hillel Magid
- 👤 Raymond Thomas
- 👤 Leonard Stiel
- 👤 John W. Pelava
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:40
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C10; C10M; C10M107/00; C10M107/20; C10M107/30; C10M107/32; C10M107/34; C09K5/041; C09K5/044; C09K5/045; C10M131/00; C10M131/02; C10M131/04; C10M167/00; C10M169/00; C10M169/04; C10M169/045; C10M171/00; C10M171/008; C09K2205/00; C09K2205/24; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/1033; C10M2209/104; C10M2209/1045; C10M2209/105; C10M2209/1055; C10M2209/106; C10M2209/1065; C10M2209/107; C10M2209/1075; C10M2209/108; C10M2209/1085; C10M2209/109; C10M2209/1095; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/06; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
76 words
A composition for use in compression refrigeration comprising: (a) tetrafluoroethane; and (b) a sufficient amount to provide lubrication of at least one polyoxyalkylene glycol which is at least difunctional with respect to the hydroxyl groups, has a molecular weight between 300 and 2000, a viscosity of about 25-150 centistokes at 37° C., a viscosity index of at least 20 and miscible in combination with (a) in the range between -40° C. and at least +20° C.
Claim 2
Dependent Claim
76 words
A composition for use in compression refrigeration comprising: (a) tetrafluoroethane; and (b) a sufficient amount to provide lubrication of at least one polyoxyalkylene glycol which is at least difunctional with respect to the hydroxyl groups, has a molecular weight between 300 and 2000, a viscosity of about 25-150 centistokes at 37° C., a viscosity index of at least 20 and miscible in combination with (a) in the range between -40° C. and at least +20° C.
Claim 3
Dependent Claim
10 words
The composition of claim 1 wherein said retrafluoroethane is 1,1,1,2-tetrafluoroethane.
Claim 4
Dependent Claim
21 words
The composition of claim 1 wherein said glycol is a blend of polyalkylene glycols having different molecular weights and hydroxyl functionalities.
Claim 5
Dependent Claim
23 words
The composition of claim 1 wherein said glycol is a polyoxpropylene glycol where the oxypropylene units are at least 80% of the total.
Claim 6
Dependent Claim
11 words
The composition of claim 1 wherein said glycol is polyoxypropylene glycol.
Claim 7
Dependent Claim
18 words
The composition of claim 1 wherein the miscible range is between -40° C. and at least +30° C.
Claim 8
Dependent Claim
18 words
The composition of claim 6 wherein the miscible range is between -40° C. and at least +40° C.
Claim 9
Dependent Claim
18 words
The composition of claim 7 wherein the miscible range is between -40° C. and at least +50° C.
Claim 10
Dependent Claim
23 words
The composition of claim 1 wherein the components (a) and (b) have the weight ratio of (a) to (b) of 99/1 to 1/99.
Claim 11
Dependent Claim
56 words
The composition of claim 1 further comprising (c) additives to enhance the performance of said composition selected from the group consisting of (1) extreme pressure and antiwear additives, (2) oxidation and thermal stability improvers, (3) corrosion inhibitors, (4) viscosity index improvers, (5) pour and floc point depressants, (6) detergents, (7) antifoaming agents, and (8) viscosity adjusters.
Claim 12
Dependent Claim
26 words
The composition of claim 1 wherein said glycol has a viscosity of about 3-24 centistokes at 98.9° C. and a viscosity index of at least 20.
Claim 13
Dependent Claim
18 words
The composition of claim 1 wherein the miscible range is between -30° C. and at least +20° C.
Claim 14
Dependent Claim
18 words
The composition of claim 1 wherein the miscible range is between -20° C. and at least +20° C.
Claim 15
Independent Claim
76 words
A method for improving lubrication in compression refrigeration equipment using tetrafluoroethane as a refrigerant consisting of employing as a lubricant at least one polyalkylene glycol which is at least difunctional with respect to the hydroxyl groups has, a molecular weight between 300 and 2000, a viscosity of about 25-150 centistokes at 37° C., a viscosity index of at least 20 and a miscible range in combination with tetrafluoroethane between -40° C. and at least +20° C.
Claim 16
Independent Claim
76 words
A method for improving lubrication in compression refrigeration equipment using tetrafluoroethane as a refrigerant consisting of employing as a lubricant at least one polyalkylene glycol which is at least difunctional with respect to the hydroxyl groups has, a molecular weight between 300 and 2000, a viscosity of about 25-150 centistokes at 37° C., a viscosity index of at least 20 and a miscible range in combination with tetrafluoroethane between -40° C. and at least +20° C.
Claim 17
Dependent Claim
10 words
The method of claim 14 wherein said tetrafluoroethane is 1,1,1,2-tetrafluoroethane.
Claim 18
Dependent Claim
21 words
The method of claim 14 wherein said lubricant comprises a blend of polyalkylene glycols having different molecular weights and hydroxy functionalities.
Claim 19
Dependent Claim
23 words
The method of claim 14 wherein said glycol is a polyoxypropylene glycol where the oxypropylene units are at least 80% of the total.
Claim 20
Dependent Claim
11 words
The method of claim 14 wherein said glycol is polyoxypropylene glycol.
Claim 21
Dependent Claim
18 words
The method of claim 14 wherein the miscible range is between -40° C. and at least +30° C.
Claim 22
Dependent Claim
18 words
The method of claim 19 wherein the miscible range is between -40° C. and at least +40° C.
Claim 23
Dependent Claim
18 words
The method of claim 20 wherein the miscible range is between -40° C. and at least +50° C.
Claim 24
Dependent Claim
26 words
The method of claim 14 wherein said glycol has a viscosity of about 3-24 centistokes at 98.9° C. and a viscosity index of at least 20.
Claim 25
Dependent Claim
18 words
The method of claim 14 wherein the miscible range is between -30° C. and at least +20° C.
Claim 26
Dependent Claim
18 words
The method of claim 14 wherein the miscible range is between -20° C. and at least +20° C.
References Cited (Backward Citations)
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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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |