Patents by Inventor Josefina M. A. Schiffer

Josefina M. A. Schiffer 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).

  • Electrical and electronic components made of a polyamide composition
    Patent number: 5965689
    Abstract: The invention relates to electrical and electronic components made of a polyamide composition and possessing an improved resistance under soldering conditions, particularly when the surface mounting technique is used. This is achieved by using a polyamide composition whose main chain essentially consists of units derived from aliphatic dicarboxylic acids and diamines or .alpha.,.omega.-amino acids, and in which 1-40% of the chain units are derived from 1,6-cyclohexanedicarboxylic acid and an aliphatic diamine, or from 1,4-cyclohexanediamine and an aliphatic dicarboxylic acid.As a result, the temperature at which blisters are formed during soldering by the infrared method is 20-30.degree. C. higher than in the case of the homo-polyamide.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: October 12, 1999
    Assignee: DSM N.V.
    Inventors: Cornelis E. Koning, Petronella M. Knape, Robert M. Leeuwendal, Josefina M. A. Schiffer
  • Process for the condensation of imides and alcohols or amines
    Patent number: 5059687
    Abstract: A process for the condensation of imides and alcohols or amines to ester acyl lactams, ester amide acyl lactams or amide acyl lactams by reacting a polyol or polyamine in the liquid phase with an acyl lactam compound is disclosed.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: October 22, 1991
    Assignee: Stamicarbon B.V.
    Inventors: Christiaan Schroder, Albert A. Van Geenen, Josefina M. A. Schiffer