Patents by Inventor Michael H. Ackerman

Michael H. Ackerman 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).

  • Polyalkyl-4-piperidinol derivatives for use as stabilizers for organic materials
    Patent number: 5439958
    Abstract: The present invention relates to novel piperidine compounds of the formula (I) and to their use as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials.The definitions of R.sub.1, R.sub.2 and R.sub.3 are given in the text.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: August 8, 1995
    Assignee: Ciba-Geigy Corporation
    Inventors: Roberto Scrima, Graziano Zagnoni, Michael H. Ackerman, James P. Galbo, Roland A. E. Winter
  • Process for preparing N-hydrocarbyloxy derivatives of sterically hindered amines
    Patent number: 4921962
    Abstract: N-hydrocarbyloxy compounds of the formula ##STR1## where E.sub.1, E.sub.2, E.sub.3 and E.sub.4 are independently an organic radical so that the carbon atoms to which they are attached are each a quaternary carbon, R is a hydrocarbon radical and T is a divalent radical are prepared directly by the reaction of the corresponding amine or oxyl compound in a hydrocarbon organic solvent with a hydroperoxide in the presence of a metal carbonyl, metal oxide or metal alkoxide catalyst in high yield and purity. These compounds are useful as light stabilizers in diverse substrate systems.
    Type: Grant
    Filed: October 19, 1988
    Date of Patent: May 1, 1990
    Assignee: Ciba-Geigy Corporation
    Inventors: James P. Galbo, Michael H. Ackerman
  • N-Piperidyl tetrahydro-1,4-oxazin-2-one light stabilizers
    Patent number: 4547537
    Abstract: Compounds of the formula L-T, where L is an unsubstituted or substituted tetrahydro-1,4-oxazine-2-one group and T is a substituted 4-piperidinyl hindered amine moiety, are effective light stabilizers for polyolefins and other organic polymers.
    Type: Grant
    Filed: August 2, 1984
    Date of Patent: October 15, 1985
    Assignee: Ciba-Geigy Corporation
    Inventors: Roger F. Malherbe, Michael H. Ackerman