Patents by Inventor Hellmuth Knoell

Hellmuth Knoell 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 graft copolymerization
    Patent number: 4338418
    Abstract: What is disclosed are the method of making a lubricating-oil additive which improves the viscosity index and has a dispersing and detergent action, which method comprises graft copolymerizing, onto an oil-soluble base polymer, from 0.5 to 10 parts of a polymerizable lactam together with 0.1 to 3 parts of a polymerizable N-heterocyclic compound, said parts being by weight of said base polymer, and the lubricating-oil additives so produced.
    Type: Grant
    Filed: December 15, 1980
    Date of Patent: July 6, 1982
    Assignee: Rohm GmbH
    Inventors: Heinz Jost, Hellmuth Knoell, Gerhard Markert, Horst Pennewiss
  • Process for graft copolymerization
    Patent number: 4281081
    Abstract: What is disclosed are the method of making a lubricating-oil additive which improves the viscosity index and has a dispersing and detergent action, which method comprises graft copolymerizing, onto an oil-soluble base polymer, from 0.5 to 10 parts of a polymerizable lactam together with 0.1 to 3 parts of a polymerizable N-heterocyclic compound, said parts being by weight of said base polymer, and the lubricating-oil additives so produced.
    Type: Grant
    Filed: February 1, 1979
    Date of Patent: July 28, 1981
    Assignee: Rohm GmbH
    Inventors: Heinz Jost, Hellmuth Knoell, Gerhard Markert, Horst Pennewiss