Patents by Inventor Menso P. Rappoldt

Menso P. Rappoldt 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).

  • Method of preparing 9.beta., 10.alpha.-5,7-diene steroids
    Patent number: 4601855
    Abstract: The invention relates to the preparation of 9.beta.,10.alpha.-5,7-diene steroids by irradiating the corresponding 9.alpha.,10.beta. steroids with filtered ultraviolet light of an antimony lamp.
    Type: Grant
    Filed: February 12, 1985
    Date of Patent: July 22, 1986
    Assignee: Duphar International Research B.V.
    Inventors: Menso P. Rappoldt, Gerardus H. M. Mos
  • Method of preparing .DELTA.5,7-steroids
    Patent number: 4464298
    Abstract: The invention relates to a method of preparing .DELTA.5,7-steroids, in particular 7-dehydrocholesterol compounds, of the general formula: ##STR1## wherein R is a hydrogen atom, a hydroxy group, optionally etherified with a C.sub.1 -C.sub.4 alkanol or esterified with a C.sub.1 -C.sub.4 alkane carboxylic acid, a C.sub.2 -C.sub.5 alkanoyl group, optionally ketalized with a C.sub.1 -C.sub.4 alkanol, or a branched or non-branched, saturated or unsaturated C.sub.1 -C.sub.10 alkyl group, optionally substituted with one or more fluorine atoms or hydroxy groups, which hydroxygroup or groups is (are) optionally etherified with C.sub.1 -C.sub.4 alkanol(s) or esterified with C.sub.1 -C.sub.4 alkane carboxylic acid(s), andR.sup.1, R.sup.2 and R.sup.3 are equal or different and represent hydrogen atoms or hydroxy groups, optionally etherified with C.sub.1 -C.sub.4 alkanols or esterified with C.sub.1 -C.sub.4 alkane carboxylic acids, or wherein R.sup.1 and R.sup.2 together constitute a C.sub.2 -C.sub.
    Type: Grant
    Filed: January 11, 1983
    Date of Patent: August 7, 1984
    Assignee: Duphar International Research B.V.
    Inventors: Menso P. Rappoldt, Louis F. Pauli, Jan Hoogendoorn