Patents by Inventor Sarah LIPPERT

Sarah LIPPERT 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).

  • Process for the preparation of polyalkyl (meth)acrylate polymers
    Publication number: 20230174695
    Abstract: A novel process can be used for the preparation of polyalkyl (meth)acrylate polymers with improved compositional distribution, which leads to better producibility, solubility, and improved performance of the polymers in lubricant compositions, especially in engine oil formulations.
    Type: Application
    Filed: April 28, 2021
    Publication date: June 8, 2023
    Applicant: Evonik Operations GmbH
    Inventors: Katrin Schöller, Sarah Lippert, Wolfgang Tschepat, Fabian Ziegler
  • Comb polymers for improving Noack evaporation loss of engine oil formulations
    Patent number: 11015139
    Abstract: A comb polymer can be used for reducing a Noack evaporation loss of a lubricant composition, especially of an engine oil composition. Application of the comb polymer to the lubricant composition can bring about the desired reduction. The comb polymer can include specified amounts of macromonomer and alkyl acrylates. Resulting lubricant compositions can include the comb polymer.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: May 25, 2021
    Assignee: Evonik Operations GmbH
    Inventors: Katrin Schöller, Stefan Maier, Sarah Lippert, Klaus Schimossek
  • Viscosity index improvers with defined molecular weight distributions
    Patent number: 10731097
    Abstract: Polyalkyl(meth)acrylate based comb polymers with weight-average molecular weights of 700,000 g/mol or greater and number-average molecular weights of 130,000 g/mol or greater can be used to improve the high temperature-high shear performance of lubricant compositions, especially of engine oil (EO) compositions. These polymers can be obtained in a reaction mixture comprising monomers, a dilution oil, and an initiator. The resulting lubricant compositions can have improved kinematic viscosity and high temperature high shear performance.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: August 4, 2020
    Assignee: Evonik Operations GmbH
    Inventors: Katrin Schöller, Sarah Lippert, Wolfgang Tschepat, Klaus Schimossek
  • COMB POLYMERS FOR IMPROVING NOACK EVAPORATION LOSS OF ENGINE OIL FORMULATIONS
    Publication number: 20200224116
    Abstract: A comb polymer can be used for reducing a Noack evaporation loss of a lubricant composition, especially of an engine oil composition. Application of the comb polymer to the lubricant composition can bring about the desired reduction. The comb polymer can include specified amounts of macromonomer and alkyl acrylates. Resulting lubricant compositions can include the comb polymer.
    Type: Application
    Filed: March 24, 2020
    Publication date: July 16, 2020
    Applicant: Evonik Operations GmbH
    Inventors: Katrin Schöller, Stefan Maier, Sarah Lippert, Klaus Schimossek
  • Comb polymers for improving Noack evaporation loss of engine oil formulations
    Patent number: 10633610
    Abstract: A comb polymer can be used for reducing a Noack evaporation loss of a lubricant composition, especially of an engine oil composition. Application of the comb polymer to the lubricant composition can bring about the desired reduction. The comb polymer can include specified amounts of macromonomer and alkyl acrylates. Resulting lubricant compositions can include the comb polymer.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: April 28, 2020
    Assignee: Evonik Operations GmbH
    Inventors: Katrin Schöller, Stefan Maier, Sarah Lippert, Klaus Schimossek
  • COMB POLYMERS FOR IMPROVING NOACK EVAPORATION LOSS OF ENGINE OIL FORMULATIONS
    Publication number: 20190203148
    Abstract: A comb polymer can be used for reducing a Noack evaporation loss of a lubricant composition, especially of an engine oil composition. Application of the comb polymer to the lubricant composition can bring about the desired reduction. The comb polymer can include specified amounts of macromonomer and alkyl acrylates. Resulting lubricant compositions can include the comb polymer.
    Type: Application
    Filed: August 28, 2017
    Publication date: July 4, 2019
    Applicant: Evonik Oil Additives GmbH
    Inventors: Katrin Schöller, Stefan Maier, Sarah Lippert, Klaus Schimossek
  • Viscosity Index Improvers with defined Molecular Weight Distributions
    Publication number: 20190071615
    Abstract: Polyalkyl(meth)acrylate based comb polymers with weight-average molecular weights of 700,000 g/mol or greater and number-average molecular weights of 130,000 g/mol or greater can be used to improve the high temperature-high shear performance of lubricant compositions, especially of engine oil (EO) compositions. These polymers can be obtained in a reaction mixture comprising monomers, a dilution oil, and an initiator. The resulting lubricant compositions can have improved kinematic viscosity and high temperature high shear performance.
    Type: Application
    Filed: August 31, 2018
    Publication date: March 7, 2019
    Applicant: Evonik Oil Additives GmbH
    Inventors: Katrin SCHÖLLER, Sarah LIPPERT, Wolfgang TSCHEPAT, Klaus SCHIMOSSEK