Patents by Inventor Curtis R. Scharf
Curtis R. Scharf has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6962895Abstract: This invention relates to a lubricating composition comprising at least about 30% by weight at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100° C., (A) from about 15% to about 40% by weight of at least one polymer, and (B) up to about 30% by weight of at least one fluidizing agent, provided that when the fluidizing agent is a poly?-olefin having a kinematic viscosity from about 2 to about 30 cSt at 100° C., then the poly?-olefin is present in an amount up to about 12% by weight, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test. The invention also relates to concentrates used in preparing lubricating compositions. The present combination of components provides good low and high temperature properties especially when used in combination with one or more mineral oils. In one aspect, the compositions provide improved oxidation resistance.Type: GrantFiled: July 7, 1997Date of Patent: November 8, 2005Assignee: The Lubrizol CorporationInventors: Curtis R. Scharf, Robert C. Richardson, Bernard C. Roell, Jr.
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Publication number: 20030139303Abstract: This invention relates to a lubricating composition comprising at least about 30% by weight at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100° C., (A) from about 15% to about 40% by weight of at least one polymer, and (B) up to about 30% by weight of at least one fluidizing agent, provided that when the fluidizing agent is a poly&agr;-olefin is present in an amount up about 2 to about 30 cSt at 100° C., then the poly&agr;-olefin is present in an amount up to about 12% by weight, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test. The invention also relates to concentrates used in preparing lubricating compositions. The present combination of components provides good low and high temperature properties especially when used in combination with one or more mineral oils. In one aspect, the compositions provide improved oxidation resistance.Type: ApplicationFiled: July 7, 1997Publication date: July 24, 2003Inventors: CURTIS R. SCHARF, ROBERT C. RICHARDSON, BERNARD C. ROELL
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Patent number: 6300288Abstract: A grease of an oil of lubricating viscosity, a polyolefin having grafted acid functionality, a metallic species capable of interacting with the acid functionality of said polyolefin to cause association among the acid groups and a co-thickening agent, has improved rheological properties. The co-thickening agent and the metallic species can together comprise a gelled overbased material, particularly an overbased carboxylate.Type: GrantFiled: March 31, 1994Date of Patent: October 9, 2001Assignee: The Lubrizol CorporationInventors: Curtis R. Scharf, Steven R. Twining, Patricia R. Todd
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Patent number: 5883057Abstract: This invention relates to a lubricating composition comprising at least about 30% by weight of at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100.degree. C., (A) from about 5% to about 30% by weight at least one polymer having a Mw less than about 10,000, and (B) from about 2% to about 12% by weight of a polymer having a Mw greater than about 15,000, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test. The invention also relates to concentrates used in preparing shear stable lubricating compositions. The present combination of components provides good low and high temperature properties to mineral oils, even at high treat levels. These lubricants have good shear stability and in one aspect have improved oxidation resistance.Type: GrantFiled: October 17, 1997Date of Patent: March 16, 1999Assignee: The Lubrizol CorporationInventors: Bernard C. Roell, Jr., Curtis R. Scharf, Robert C. Richardson
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Patent number: 5523005Abstract: Gear oil compositions are described which comprise a lubricating base oil having dissolved therein:(A) at least one phosphite ester characterized by the formula: ##STR1## wherein R.sup.1 and R.sup.2 are hydrocarbyl based groups of from 1 to 30 carbon atoms and(B) at least one metal overbased composition.Another embodiment of the invention comprises the above-mentioned (A) and (B) with(C) a sulfurization product of an aliphatic olefinic compound containing from 3 to 30 carbon atoms.Type: GrantFiled: September 27, 1994Date of Patent: June 4, 1996Assignee: The Lubrizol CorporationInventors: Stephen A. Di Biase, Curtis R. Scharf, James J. Schwind, Craig D. Tipton
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Patent number: 5489721Abstract: This invention deals with viscosity improvers which are obtained through the use of a mixed catalyst system comprising a primary and/or secondary organo halide and a Lewis acid catalyst.Type: GrantFiled: January 6, 1994Date of Patent: February 6, 1996Assignee: The Lubrizol CorporationInventors: Roger L. Sowerby, Curtis R. Scharf
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Patent number: 5429758Abstract: Compositions useful as oil additives are prepared in a solvent or a solvent free system by reacting (B) an unsaturated carboxylic acid reagent with (A) a hydrogenated block copolymer in the presence of (C) free radical initiators. The formed reaction product (D) can be further reacted with a (E) primary amine-containing compound in a solvent or a solvent free system.Type: GrantFiled: August 27, 1990Date of Patent: July 4, 1995Assignee: The Lubrizol CorporationInventors: Katsumi Hayashi, T. Robert Hopkins, Curtis R. Scharf
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Patent number: 5371130Abstract: A composition of an oil-soluble, olefin-based polymer and an oil-soluble polar polymer having nitrogen functionality, wherein the polymers in combination in oil exhibit incompatibility as evidenced by phase separation, shows improved compatibility by addition to the mixture of certain hydrocarbyl substituted hydroxyaromatic materials.Type: GrantFiled: October 7, 1993Date of Patent: December 6, 1994Assignee: The Lubrizol CorporationInventors: Richard M. Lange, Curtis R. Scharf
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Patent number: 5364994Abstract: The invention deals with viscosity improvers which are .alpha.-olefin polymers and are particularly useful in lubricating compositions comprising (A) a liquid .alpha.-olefin polymer having a number average molecular weight from about 2,000 to about 100,000 and having derived from .alpha.-olefins having from about 4 to about 30 carbon atoms, provided further that (A) has a bimodal molecular weight distribution having (i) a peak molecular weight maximum at 2,000 to 5,000 for a lower molecular weight component and (ii) a peak molecular weight maximum at 50,000 to 75,000 for a higher molecular weight component; (B) an oil of lubricating viscosity and (C) at least one member selected from the group consisting of a friction modifier, a sulfurized olefin, an ash-producing detergent and, an ashless dispersant.Type: GrantFiled: July 16, 1992Date of Patent: November 15, 1994Assignee: The Lubrizol CorporationInventor: Curtis R. Scharf
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Patent number: 5345024Abstract: This invention deals with viscosity improvers which are obtained through the use of a mixed catalyst system comprising a tertiary organo halide and a Lewis acid catalyst.Type: GrantFiled: August 6, 1990Date of Patent: September 6, 1994Assignee: The Lubrizol CorporationInventor: Curtis R. Scharf
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Patent number: 5334318Abstract: Nitrogen containing carboxylic compounds useful in reducing hydrogen sulfide are described herein. The compositions of the invention also desirably contain an alkali or alkaline earth metal containing compound.Type: GrantFiled: July 6, 1993Date of Patent: August 2, 1994Assignee: The Lubrizol CorporationInventors: James N. Vinci, Curtis R. Scharf
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Patent number: 5302772Abstract: The invention pertains to a process for preparing a liquid polymer using a mixed catalyst system comprising a primary organo halide and a Lewis acid catalyst.Type: GrantFiled: December 16, 1992Date of Patent: April 12, 1994Assignee: The Lubrizol CorporationInventors: Roger L. Sowerby, Curtis R. Scharf
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Patent number: 5210362Abstract: This invention deals with viscosity improvers which are obtained through the use of a mixed catalyst system comprising a primary and/or secondary organo halide and a Lewis acid catalyst.Type: GrantFiled: June 7, 1989Date of Patent: May 11, 1993Assignee: The Lubrizol CorporationInventors: Roger L. Sowerby, Curtis R. Scharf
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Patent number: 5182037Abstract: This invention is directed to phosphorus and/or nitrogen-containing derivative compositions of sulfur containing compounds which are suitable particularly for use as additives for lubricants, fuels and functional fluids. The lubricants, fuels, and/or functional fluids containing the derivatives of this invention exhibit improved anti-wear, extreme pressure and antioxidant properties.Type: GrantFiled: November 7, 1986Date of Patent: January 26, 1993Assignee: The Lubrizol CorporationInventors: Joseph W. Pialet, Curtis R. Scharf, Stephen A. DiBiase
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Patent number: 4968853Abstract: This invention deals with viscosity improvers which are obtained through the use of a mixed catalyst system comprising a tertiary organo halide and a Lewis acid catalyst. A liquid alpha-olefin polymer composition having a polymodal distribution with peak molecular weight maximum at 2,000 to 5,000 and at 50,000 to 75,000 is useful as a lubricating oil.Type: GrantFiled: December 29, 1987Date of Patent: November 6, 1990Assignee: The Lubrizol CorporationInventor: Curtis R. Scharf
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Patent number: 4873006Abstract: Nitrogen containing carboxylic compounds useful in reducing hydrogen sulfide are described herein. The compositions of the invention also desirably contain an alkali or alkaline earth metal containing compound.Type: GrantFiled: September 1, 1988Date of Patent: October 10, 1989Assignee: The Lubrizol CorporationInventors: James N. Vinci, Curtis R. Scharf
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Patent number: 4752416Abstract: Lubricating and functional fluid compositions are described which comprise at least one oil of lubricating viscosity and an extreme-pressure and friction-modifying amount of(A) at least one phosphite ester characterized by the formula ##STR1## wherein R.sup.1 is a straight-chain hydrocarbyl group and R.sup.2 is a branched-chain hydrocarbyl group. The invention also relates to compositions which comprise the combination of such phosphite esters as represented by Formula I and various sulfur-containing compositions. The compositions comprising said combinations also are useful in lubricating and functional fluid compositions including lubricating oils and greases. Aqueous systems containing the phosphite esters represented by Formula I as well as combinations of phosphite esters with sulfur-containing compositions also are described.Type: GrantFiled: December 11, 1986Date of Patent: June 21, 1988Assignee: The Lubrizol CorporationInventors: Curtis R. Scharf, Stephen A. DiBiase, William C. Tritt
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Oil-soluble reaction products of an acylated reaction product, a polyamine, and mono-functional acid
Patent number: 4670173Abstract: Oil-soluble compositions, useful as dispersant viscosity modifiers, are formed by the reaction product of an acylating product (D) a (F) polyamine, and a (G) mono-functional acid. The compositions can be prepared in solvent such as a hydrocarbon oil or in the absence of a solvent.Type: GrantFiled: December 19, 1985Date of Patent: June 2, 1987Assignee: The Lubrizol CorporationInventors: Katsumi Hayashi, T. Robert Hopkins, Curtis R. Scharf