Patents by Inventor Jan U. Stenhede

Jan U. Stenhede 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 controlling the epimeric distribution in the preparation of 16,17-acetals of pregnane derivatives
    Patent number: 4925933
    Abstract: A method of controlling the epimeric distribution in the preparation of 16,17-acetals of pregnane derivatives characterized in reaction of a corresponding 16,17-acetonide with an aldehyde or ketone in (a) hydrocarbon solvent wherein the solubility of the pregnane derivative is less than 1 mg/l or in a halogenated hydrocarbon solvent together with a hydrohalogen acid or an organic sulphonic acid as catalyst and in the presence of small grains of an insert material in the reaction medium or (b) a halogenated hydrocarbon solvent together with a hydrohalogen acid an organic sulphonic acid as catalyst and in the presence of an epimeric distribution modifier.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: May 15, 1990
    Assignee: Astra Pharmaceutical Production Aktiebolag
    Inventors: Edib Jakupovic, Roy T. Sourander, Jan U. Stenhede, Rolf P. Svensson
  • Process for stabilization of bacampicillin hydrochloride
    Patent number: 4626532
    Abstract: A new process for the stabilization of bacampicillin hydrochloride against degradation by humidity characterized by the incorporation of between 3 to 9% by weight of straight-chain alkanes, alkenes, fatty acids, alcohols, and esters of fatty acids and alcohols with molecular weights between 144 and 350, which may be carried out in one step together with wetmassing for granulation.
    Type: Grant
    Filed: October 29, 1985
    Date of Patent: December 2, 1986
    Assignee: Astra Lakemedel Aktieboag
    Inventors: Ulf A. Kjellberg, Per G. H. Nyqvist, Jan U. Stenhede, Lars B. Stenmark