Patents by Inventor Juanita E. Van Koppenhagen

Juanita E. Van Koppenhagen 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).

  • Patent number: 6514439
    Abstract: Microcapsules of a microcapsule formed of a polyurea shell wall and an encapsulated ingredient or ingredients enclosed within the wall, the wall comprising at least one oligomeric acetal having the moiety in which R is (a) a moiety containing a chain of from 5 to about 40 optionally substituted carbon atoms, (b) a moiety containing a chain of from 4 to about 40 carbon atoms and one or more internally linked oxygen or sulfur atoms or —NH-groups, or (c) an optionally substituted ethylene or propylene moiety Z is (a) an optionally substituted phenyl group, (b) an optionally substituted C1-C20 alkyl, C2-C20 alkenyl, C3-C8 cycloalkyl or C5-C8 cycloalkenyl group, or (c) benzoyl, and n is 1 if R is (a) or (b), or is 2-20 if R is (c).
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: February 4, 2003
    Assignee: Syngenta Ltd.
    Inventors: Juanita E. Van Koppenhagen, Herbert B. Scher, Kuo-shin Lee, Ian M. Shirley, Philip Wade, Richard Follows
  • Publication number: 20020037306
    Abstract: Microcapsules formed from an aminoplast shell wall and an encapsulated ingredient or ingredients enclosed within the wall in which the wall contains a base-cleavable ester moiety. These capsules have been found to be sensitive to the presence of base such that in the presence of base, the capsule walls are relatively quickly disintegrated or degraded so as to produce a relatively quick release of the encapsulated materials. Microcapsules of this invention are particularly suitable for use in controlling insects having an alkaline gut such as certain lepidoptera in that the capsule shell wall may be designed so as to quickly disintegrate under the alkaline conditions present in the gut of the insect thus providing a microcapsule which is safe to handle but which is selectively effective against certain undesirable insects while not harmful to beneficial insects or insects which do not feed on the capsule materials.
    Type: Application
    Filed: February 8, 2001
    Publication date: March 28, 2002
    Inventors: Juanita E. Van Koppenhagen, Herbert Benson Scher, Kuo-Shin Lee, Chi Chang Lee, Ian Malcolm Shirley, Philip Wade, Richard Follows