Patents by Inventor Rudolf J. A. Eckert

Rudolf J. A. Eckert 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).

  • Gear oil viscosity index improvers
    Patent number: 5070131
    Abstract: A gear oil composition is provided, the composition comprising a hydrogenated star conjugated diolefin polymer having arms with weight average molecular weights between about 3,000 and about 15,000. Such star polymers are effective as viscosity index improvers, and yet are sufficiently shear stable for service in gear oil lubricants.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: December 3, 1991
    Assignee: Shell Oil Company
    Inventors: Robert B. Rhodes, Rudolf J. Eckert, Donald E. Loeffler
  • Oil compositions containing modified star polymers
    Patent number: 5035820
    Abstract: Lubricating oil compositions which contain hydrogenated diene star polymers grafted with N-vinylimidazole exhibit improved engine performance when prepared by grafting the polymer in an oil mixture containing at least 6% by weight of the star polymer. The grafting is accomplished by contacting the polymer with from about 3.0 to about 5.5 wt % N-vinylimidazole when N-vinylimidazole is the sole reactant and from about 1.0 to about 5.0 wt % N-vinylimidazole when N-vinylimidazole is used in combination with N-vinylpyrrolidone.
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: July 30, 1991
    Assignee: Shell Oil Company
    Inventors: Robert B. Rhodes, Rudolf J. A. Eckert
  • Biopolymer formulations and processes for preparing them
    Patent number: 4670550
    Abstract: Biopolymer formulation, in particular a polysaccharide-containing water in oil emulsion, process for preparing such emulsions and process for concentrating these emulsions. Aqueous systems thickened by the incorporation of biopolymer emulsions.
    Type: Grant
    Filed: September 7, 1984
    Date of Patent: June 2, 1987
    Assignee: Shell Oil Company
    Inventors: Jan J. Bleeker, Jan H. Lammers, Jacob B. Roest, Rudolf J. A. Eckert
  • Process for the preparation of oil-soluble hydrogenated modified star-shaped polymers
    Patent number: 4557849
    Abstract: A process for the preparation of an oil-soluble, star-shaped product having viscosity index-improving and dispersant properties, comprising modifying a hydrogenated star-shaped polymer wherein said arms are hydrogenated homopolymers and copolymers of conjugated dienes and mono-alkenyl arenes, and wherein the hydrogenated polymer is metallated with an organolithium compound in the presence of a metallation promoter, and subsequently reacted with a vinyl pyridine or a carbonyl group containing organic compound.
    Type: Grant
    Filed: July 13, 1984
    Date of Patent: December 10, 1985
    Assignee: Shell Oil Company
    Inventor: Rudolf J. A. Eckert
  • Preparation of a lubricating oil additive, an additive thus prepared _and a lubricating oil containing this additive
    Patent number: 4490267
    Abstract: Lubricating oil additives having superior viscometric and detergent properties are prepared by polymerizing an alkyl(meth)acrylate in a solvent containing a star-shaped polymer.
    Type: Grant
    Filed: June 13, 1983
    Date of Patent: December 25, 1984
    Assignee: Shell Oil Company
    Inventor: Rudolf J. A. Eckert
  • Lube oil additive
    Patent number: 4358565
    Abstract: A modified hydrogenated star-shaped polymer comprising a nucleus, e.g., divinylbenzene, with polymeric arms linked to it is prepared by grafting a hydrogenated star-shaped polymer with a nitrogen-containing polymerizable polar organic compound, e.g., 2-vinylpyridine or 4-vinylpyridine. Such polymers are useful as viscosity index improvers for lube oil compositions, and also possess dispersancy.
    Type: Grant
    Filed: October 31, 1980
    Date of Patent: November 9, 1982
    Assignee: Shell Oil Company
    Inventor: Rudolf J. A. Eckert
  • Hydrogenated star-shaped polymer
    Patent number: 4156673
    Abstract: A viscosity index-improver for lubricating oil compositions is disclosed. This viscosity index improver is a hydrogenated star-shaped polymer comprising a poly(poly-alkenyl coupling agent) nucleus and at least four polymeric arms linked to the nucleus wherein the arms are hydrogenated homopolymers and copolymers of conjugated dienes, hydrogenated copolymers of conjugated dienes and monoalkenyl arenes, or mixtures thereof.
    Type: Grant
    Filed: July 21, 1978
    Date of Patent: May 29, 1979
    Assignee: Shell Oil Company
    Inventor: Rudolf J. A. Eckert
  • Hydrogenated star-shaped polymer
    Patent number: 4116917
    Abstract: A viscosity index-improver for lubricating oil compositions is disclosed. This viscosity index improver is a hydrogenated star-shaped polymer comprising a poly(poly-alkenyl coupling agent) nucleus and at least four polymeric arms linked to the nucleus wherein the arms are hydrogenated homopolymers and copolymers of conjugated dienes, hydrogenated copolymers of cojugated dienes and monoalkenyl arenes, or mixtures thereof.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: September 26, 1978
    Assignee: Shell Oil Company
    Inventor: Rudolf J. A. Eckert