US4396514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating composition and method for making
Assignee: Individual
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Filing: 1982-02-04
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Granted: 1983-08-02
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Expires: 2002-02-04
Abstract
Abstract A lubricating composition is provided which is a stable dispersion of a lubricating fluid such as a natural or synthetic petroleum distillate, and a finely divided polymeric fluorocarbon powder such as polytetrafluoroethylene such as Teflon and a silicon dioxide powder such as a fumed silica. The composition is best provided by utilization of a disc impeller at elevated temperature to attain a moisture-free, even dispersion of the Teflon and the silica in the fluid. The lubricating composition is particularly useful in wide temperature range service, particularly so at extremely high and low temperatures.
Inventors
- 👤 Sal A. Randisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:28
CPC Classifications
C; C10; C10M; C10M161/00; C10M125/00; C10M125/26; C10M147/00; C10M147/02; C10M2201/00; C10M2201/087; C10M2201/10; C10M2201/102; C10M2201/105; C10M2205/00; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; 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: 21
Claim 1
Independent Claim
162 words
A lubricating composition useful for wide temperature range service, said lubricating composition having a service temperature range from about -72° F. to about 500° F. and an electrical resistance ranging from about 1×10 14 Ohm-cm to about 2×10 14 Ohm-cm at 100 volts, said lubricating composition comprising a stable dispersion of: a. a hydrocarbon lubricating liquid, said hydrocarbon liquid comprising from about 50% to about 95% of said lubricating composition; b. a finely divided polymeric fluorocarbon powder comprising polytetrafluoroethylene in the form of a finely divided powder with particles ranging from about 0.1 to 100 microns in size and having a melting temperature above 450° F., said polymeric fluorocarbon powder comprising from about 1% to about 3% of said lubricating composition, and; c. a silicon dioxide in the form of a finely divided fumed silica powder with particles ranging from about 7 to about 40 millimicrons in size, said silicon dioxide comprising from about 2% to about 10% of said lubricating composition.
Claim 2
Dependent Claim
162 words
A lubricating composition useful for wide temperature range service, said lubricating composition having a service temperature range from about -72° F. to about 500° F. and an electrical resistance ranging from about 1×10 14 Ohm-cm to about 2×10 14 Ohm-cm at 100 volts, said lubricating composition comprising a stable dispersion of: a. a hydrocarbon lubricating liquid, said hydrocarbon liquid comprising from about 50% to about 95% of said lubricating composition; b. a finely divided polymeric fluorocarbon powder comprising polytetrafluoroethylene in the form of a finely divided powder with particles ranging from about 0.1 to 100 microns in size and having a melting temperature above 450° F., said polymeric fluorocarbon powder comprising from about 1% to about 3% of said lubricating composition, and; c. a silicon dioxide in the form of a finely divided fumed silica powder with particles ranging from about 7 to about 40 millimicrons in size, said silicon dioxide comprising from about 2% to about 10% of said lubricating composition.
Claim 3
Dependent Claim
21 words
The lubricating composition of claim 1, wherein the fumed silica is evenly dispersed within the lubricating liquid and polymeric fluorocarbon powder.
Claim 4
Dependent Claim
14 words
The lubricating composition of claim 2, wherein the lubricating liquid is a petroleum distillate.
Claim 5
Dependent Claim
13 words
The lubricating composition of claim 2, wherein the lubricating liquid is synthesized hydrocarbon.
Claim 6
Dependent Claim
18 words
The lubricating composition of claim 2, wherein the lubricating liquid comprises a petroleum distillate and a synthesized hydrocarbon.
Claim 7
Independent Claim
249 words
A method for making a lubricating composition useful for wide temperature range service, said lubricating composition being a stable dispersion and having a service temperature range from about -72° F. to about 500° F. and an electrical resistance ranging from about 1×10 14 Ohm-cm to about 2×10 14 Ohm-cm at 100 volts, said method comprising: a. providing a hydrocarbon lubricating liquid, said hydrocarbon liquid comprising from about 50% to about 95% of said lubricating composition; b. adding and mixing into said hydrocarbon liquid finely divided polymeric fluorocarbon particulates in a first mixing step, said polymeric fluorocarbon particulates comprising polytetrafluoroethylene in the form of a finely divided powder with particles ranging from about 0.1 to 100 microns in size and having a melting temperature above 450° F., said polymeric fluorocarbon powder comprising from about 1% to about 3% of said lubricating composition, and c. subsequently adding to the hydrocarbon liquid-polymeric fluorocarbon powder mixture produced by step (b), and mixing into said mixture in a second mixing step, finely divided silicon dioxide particulates in the form of a finely divided fumed silica powder with particles ranging from about 7 to about 40 millimicrons in size, said silicon dioxide particulates comprising from about 2% to about 10% of said lubricating coposition; said first and second mixing steps being carried out by contacting said components with a rotating disc impeller, so as to provide evenly dispersed particulates of both said polymeric fluorocarbon powder and said silicon dioxide powder in said hydrocarbon lubricating liquid.
Claim 8
Independent Claim
249 words
A method for making a lubricating composition useful for wide temperature range service, said lubricating composition being a stable dispersion and having a service temperature range from about -72° F. to about 500° F. and an electrical resistance ranging from about 1×10 14 Ohm-cm to about 2×10 14 Ohm-cm at 100 volts, said method comprising: a. providing a hydrocarbon lubricating liquid, said hydrocarbon liquid comprising from about 50% to about 95% of said lubricating composition; b. adding and mixing into said hydrocarbon liquid finely divided polymeric fluorocarbon particulates in a first mixing step, said polymeric fluorocarbon particulates comprising polytetrafluoroethylene in the form of a finely divided powder with particles ranging from about 0.1 to 100 microns in size and having a melting temperature above 450° F., said polymeric fluorocarbon powder comprising from about 1% to about 3% of said lubricating composition, and c. subsequently adding to the hydrocarbon liquid-polymeric fluorocarbon powder mixture produced by step (b), and mixing into said mixture in a second mixing step, finely divided silicon dioxide particulates in the form of a finely divided fumed silica powder with particles ranging from about 7 to about 40 millimicrons in size, said silicon dioxide particulates comprising from about 2% to about 10% of said lubricating coposition; said first and second mixing steps being carried out by contacting said components with a rotating disc impeller, so as to provide evenly dispersed particulates of both said polymeric fluorocarbon powder and said silicon dioxide powder in said hydrocarbon lubricating liquid.
Claim 9
Dependent Claim
21 words
The method of claim 6, further comprising adding a surfactant to the liquid and then adding the particulates to the liquid.
Claim 10
Dependent Claim
21 words
The method of claim 7, wherein the polymeric fluorocarbon particulates comprising polytetrafluoroethylene are added prior to adding the silicon dioxide particulates.
Claim 11
Dependent Claim
11 words
The method of claim 6, wherein said disc has flanged teeth.
Claim 12
Dependent Claim
27 words
The method of claim 6, wherein said liquid is first mixed to a temperature of about 105° F. to 125° F., and then the particulates are added.
Claim 13
Dependent Claim
21 words
The method of claim 10, further comprising adding a surfactant to the fluid and then adding the particulates to the fluid.
Claim 14
Dependent Claim
14 words
The method of claim 10, wherein said temperature is about 112° to 118° F.
Claim 15
Dependent Claim
19 words
The method of claim 10, wherein the temperature is achieved through friction of the disc action in the liquid.
Claim 16
Dependent Claim
16 words
The method of claim 10, wherein the mixing at said temperature provides an essentially moisture-free liquid.
Claim 17
Dependent Claim
13 words
The method of claim 6, wherein said disc further comprises radially curved grooves.
Claim 18
Dependent Claim
31 words
The method of claim 7, wherein the lubricating liquid, surfactant, polymeric fluorocarbon particulates and silicon dioxide particulates are mixed for a total of about 2 hours to provide the lubricating composition.
Claim 19
Dependent Claim
15 words
The method of claim 16, wherein the mixing for that time provides a fixotropic composition.
Claim 20
Dependent Claim
19 words
The method of claim 16, wherein the lubricating liquid and surfactant are mixed for about 20 to 30 minutes.
Claim 21
Dependent Claim
22 words
The method of claim 18, wherein the lubricating liquid, surfactant and polymeric fluorocarbon particulates are mixed for about 10 to 15 minutes.
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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |