US5273670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siloxane-based refrigerating oil
Assignee: Momentive Performance Materials GmbH
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Filing: 1992-08-31
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Granted: 1993-12-28
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Expires: 2012-08-31
Abstract
Abstract Refrigerating oils useful in refrigerating devices to produce temperatures lower than -86 DEG C. and as low as -130 DEG C. and free from salts, alcohols, halogenated hydrocarbons and halocarbons and having a viscosity below 10 mm2/s at -40 DEG C., consisting essentially of mixtures of at least two members selected from the group consisting of hexamethyl disiloxane, octamethyl trisiloxane, linear decamethyl tetrasiloxane, octamethyl cyclotetrasiloxane and decamethyl cyclopentasiloxane.
Inventors
- 👤 Robert Endres
- 👤 Hans-Horst Steinbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:02
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08; C10; C10M; C10M107/00; C10M107/50; C10M111/00; C10M111/04; C10M169/00; C10M169/04; C10M169/044; C10M2227/00; C10M2227/02; C10M2227/025; C10M2227/04; C10M2227/045; C10M2229/00; C10M2229/02; C10M2229/025; C10M2229/04; C10M2229/0405; C10M2229/041; C10M2229/0415; C10M2229/042; C10M2229/0425; C10M2229/043; C10M2229/0435; C10M2229/044; C10M2229/0445; C10M2229/045; C10M2229/0455; C10M2229/046; C10M2229/0465; C10M2229/047; C10M2229/0475; C10M2229/048; C10M2229/0485; C10M2229/05; C10M2229/0505; C10M2229/051; C10M2229/0515; C10M2229/052; C10M2229/0525; C10M2229/053; C10M2229/0535; C10M2229/054; C10M2229/0545; 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: 20
Claim 1
Independent Claim
139 words
A refrigerating oil useful in refrigerating devices to produce temperatures lower than -86° C. and as low as -130° C. and free from salts, alcohols, halogenated hydrocarbons and halocarbons and having a viscosity below 10 mm 2 /s at -40° C., consisting essentially of a mixture of about 90 percent by weight octamethyl trisiloxane and one or more siloxanes selected from the group consisting of: (a) 0 to about 10 percent by weight of octamethyl cyclotetrasiloxane; and (b) 0 to about 10 percent by weight of decamethyl cyclopentasiloxane; wherein the weight percent is based on the weight of the oil and at least one siloxane from (a) or (b) is present in an amount greater than zero, and the total amount of the siloxanes from (a) and (b) in the mixture is at least about ten percent by weight.
Claim 2
Dependent Claim
139 words
A refrigerating oil useful in refrigerating devices to produce temperatures lower than -86° C. and as low as -130° C. and free from salts, alcohols, halogenated hydrocarbons and halocarbons and having a viscosity below 10 mm 2 /s at -40° C., consisting essentially of a mixture of about 90 percent by weight octamethyl trisiloxane and one or more siloxanes selected from the group consisting of: (a) 0 to about 10 percent by weight of octamethyl cyclotetrasiloxane; and (b) 0 to about 10 percent by weight of decamethyl cyclopentasiloxane; wherein the weight percent is based on the weight of the oil and at least one siloxane from (a) or (b) is present in an amount greater than zero, and the total amount of the siloxanes from (a) and (b) in the mixture is at least about ten percent by weight.
Claim 3
Dependent Claim
20 words
The refrigerating oil of claim 1, wherein octamethyl cyclotetrasiloxane is present in an amount of about 10 percent by weight.
Claim 4
Dependent Claim
20 words
The refrigerating oil of claim 1, wherein decamethyl cyclopentasiloxane is present in an amount of about 10 percent by weight.
Claim 5
Dependent Claim
139 words
A refrigerating oil useful in refrigerating devices to produce lower than -86° C. and as low as -130° C. and free from salts, alcohols, halogenated hydrocarbons and having a viscosity below 10 mm 2 /s at -40° C., consisting essentially of a mixture of between 90 to about 95 percent by weight of decamethyl tetrasiloxane and one or more siloxanes selected from the group consisting of: (a) 0 to about 10 percent by weight of octamethyl cyclotetrasiloxane; and (b) 0 to about 10 percent by weight of decamethyl cyclopentasiloxane; wherein the weight percent is based on the weight of the oil and at least one siloxane from (a) or (b) is present in an amount greater than zero and the total amount of siloxanes from (a) and (b) in the mixture is at least about ten percent by weight.
Claim 6
Dependent Claim
139 words
A refrigerating oil useful in refrigerating devices to produce lower than -86° C. and as low as -130° C. and free from salts, alcohols, halogenated hydrocarbons and having a viscosity below 10 mm 2 /s at -40° C., consisting essentially of a mixture of between 90 to about 95 percent by weight of decamethyl tetrasiloxane and one or more siloxanes selected from the group consisting of: (a) 0 to about 10 percent by weight of octamethyl cyclotetrasiloxane; and (b) 0 to about 10 percent by weight of decamethyl cyclopentasiloxane; wherein the weight percent is based on the weight of the oil and at least one siloxane from (a) or (b) is present in an amount greater than zero and the total amount of siloxanes from (a) and (b) in the mixture is at least about ten percent by weight.
Claim 7
Dependent Claim
20 words
The refrigerating oil of claim 4, wherein octamethyl cyclotetrasiloxane is present in an amount of about 10 percent by weight.
Claim 8
Dependent Claim
20 words
The refrigerating oil of claim 4, wherein decamethyl cyclopentasiloxane is present in an amount of about 10 percent by weight.
Claim 9
Dependent Claim
146 words
A refrigerating oil useful in refrigerating devices to produce temperatures lower than -86° C. and as low as -130° C. and free from salts, alcohols, halogenated hydrocarbons and halocarbons and having a viscosity below 10 mm 2 /s at -40° C., consisting essentially of a mixture of siloxanes selected from the group consisting of: (a) about 5.6 to 31 percent by weight of octamethyl trisiloxane; (b) about 64.3 to 82.4 percent by weight of decamethyl tetrasiloxane; (c) 0 to about 12.5 percent weight of octamethyl cyclotetrasiloxane; and (d) 0 to about 12.5 percent by weight of decamethyl cyclopentasiloxane; wherein the weight percent is based on the weight of the oil and at least one of the components (c) or (d) is present in an amount greater than zero and the weight percentages of the components (a) to (d) present in the oil mixture totals 100 percent.
Claim 10
Dependent Claim
146 words
A refrigerating oil useful in refrigerating devices to produce temperatures lower than -86° C. and as low as -130° C. and free from salts, alcohols, halogenated hydrocarbons and halocarbons and having a viscosity below 10 mm 2 /s at -40° C., consisting essentially of a mixture of siloxanes selected from the group consisting of: (a) about 5.6 to 31 percent by weight of octamethyl trisiloxane; (b) about 64.3 to 82.4 percent by weight of decamethyl tetrasiloxane; (c) 0 to about 12.5 percent weight of octamethyl cyclotetrasiloxane; and (d) 0 to about 12.5 percent by weight of decamethyl cyclopentasiloxane; wherein the weight percent is based on the weight of the oil and at least one of the components (c) or (d) is present in an amount greater than zero and the weight percentages of the components (a) to (d) present in the oil mixture totals 100 percent.
Claim 11
Dependent Claim
48 words
The refrigerating oil of claim 7 wherein octamethyl trisiloxane is present in an amount of about 31 percent by weight and decamethyl tetrasiloxane is present in an amount of about 64.3 percent by weight and octamethyl cyclotetrasiloxane is present in an amount of about 4.7 percent by weight.
Claim 12
Dependent Claim
57 words
The refrigerating oil of claim 7 wherein octamethyl trisiloxane is present in an amount of about 18.1 to about 19 percent by weight and decamethyl tetrasiloxane is present in an amount of about 73.5 to about 78.5 percent by weight and octamethyl cyclotetrasiloxane is present in an amount of about 2.5 to about 12.5 percent by weight.
Claim 13
Dependent Claim
54 words
The refrigerating oil of claim 7 wherein octamethyl trisiloxane is present in an amount of about 19 percent by weight and decamethyl tetrasiloxane is present in an amount of about 68.5 to about 78.5 percent by weight and decamethyl cyclopentasiloxane is present in an amount of about 2.5 to about 12.5 percent by weight.
Claim 14
Dependent Claim
58 words
The refrigerating oil of claim 7 wherein octamethyl trisiloxane is present in an amount of about 19 percent by weight and decamethyl tetrasiloxane is present in an amount of about 73.5 percent by weight and octamethyl cyclotetrasiloxane is present in an amount of about 2.5 percent and decamethyl cyclopentasiloxane is present in an amount of about 5 percent.
Claim 15
Dependent Claim
62 words
The refrigerating oil of claim 7 wherein octamethyl trisiloxane is present in an amount of about 5.6 percent by weight and decamethyl tetrasiloxane is present in an amount of about 82.4 percent by weight and octamethyl cyclotetrasiloxane is present in an amount of about 11 percent by weight and decamethyl cyclopentasiloxane is present in an amount of about 1 percent by weight.
Claim 16
Dependent Claim
143 words
A refrigerating oil useful in refrigerating devices to produce temperatures lower than -86° C. and as low as -130° C. and free from salts, alcohols, halogenated hydrocarbons and halocarbons and having a viscosity below 10 mm 2 /s at -40° C., consisting essentially of a mixture of siloxanes selected from the group consisting of: (a) about 20.6 to about 33.3 percent by weight of hexamethyl disiloxane; (b) about 30 to about 33.3 percent by weight of octamethyl trisiloxane; (c) about 39.4 to about 43.8 percent by weight of decamethyl tetrasiloxane; (d) 0 to about 10 percent by weight of octamethyl cyclotetrasiloxane; and (e) 0 to about 10 percent by weight of decamethyl cyclopentasiloxane; wherein the weight percent is based on the weight of the oil and the weight percentages of the components (a) to (e) present in the oil mixture totals 100 percent.
Claim 17
Dependent Claim
143 words
A refrigerating oil useful in refrigerating devices to produce temperatures lower than -86° C. and as low as -130° C. and free from salts, alcohols, halogenated hydrocarbons and halocarbons and having a viscosity below 10 mm 2 /s at -40° C., consisting essentially of a mixture of siloxanes selected from the group consisting of: (a) about 20.6 to about 33.3 percent by weight of hexamethyl disiloxane; (b) about 30 to about 33.3 percent by weight of octamethyl trisiloxane; (c) about 39.4 to about 43.8 percent by weight of decamethyl tetrasiloxane; (d) 0 to about 10 percent by weight of octamethyl cyclotetrasiloxane; and (e) 0 to about 10 percent by weight of decamethyl cyclopentasiloxane; wherein the weight percent is based on the weight of the oil and the weight percentages of the components (a) to (e) present in the oil mixture totals 100 percent.
Claim 18
Dependent Claim
48 words
The refrigerating oil of claim 13 wherein hexamethyl disiloxane is present in an amount of about 22.9 percent by weight and octamethyl trisiloxane is present in an amount of about 33.3 percent by weight and decamethyl tetrasiloxane is present in an amount of about 43.8 percent by weight.
Claim 19
Dependent Claim
20 words
The refrigerating oil of claim 13 wherein octamethyl cyclotetrasiloxane is present in an amount of about 10 percent by weight.
Claim 20
Dependent Claim
20 words
The refrigerating oil of claim 13 wherein decamethyl cyclopentasiloxane is present in an amount of about 10 percent by weight.
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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) | 1996-12-27 | 1997-06-28 | 1997-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-27 | 2001-06-28 | 2001-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-27 | 2005-06-28 | 2005-12-28 | $7700.00 | Window Closed / Lapsed |