Patents by Inventor Siegmund Lang

Siegmund Lang 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: 6433152
    Abstract: The invention relates to sophoroselipids of formula (I) wherein R4 represents H, —CH2CH3, —CH2CH2CH3, n is an integer number from 2 to 27, R1 and R2 represent, independently from each other, H or a group of formula (II), and R3 represents H or —OH. The invention also relates to a method for producing sophoroselipids of formula (I) wherein R1, R2, R3 and n have the aforementioned meanings and R4 represents —CH3, —CH2CH3 or —CH2CH2CH3. According to this method, a yeast capable of secreting a sophoroselipid in the form of a lactone in the culture excess, is fermented in a culture medium containing a glycerin. a succinate, a mono-, di- and/or tri-saccharide and a lipid precursor, said sophoroslipid being then isolated from the culture solution. The inventive method is characterised in that the lipid precursor contains one or more 3-alkanols, 4-alkanols or an alkanone with a chain length from 6 to 30 carbon atoms or mixtures of said alkanoistalkanone.
    Type: Grant
    Filed: July 3, 2000
    Date of Patent: August 13, 2002
    Assignee: Aventis Research & Technologies GmbH & Co KG
    Inventors: Siegmund Lang, Andreas Brakemeier, Dieter Wullbrandt, Andreas Seiffert-Störicko
  • Patent number: 5767255
    Abstract: The present invention relates to glucose- and sophorose-lipids of the formula I ##STR1## in which R.sup.4 is --OH or a group of the formula II, ##STR2## n is an integer from 2 to 26, R.sup.1 and R.sup.2 are, independently of one another, H or ##STR3## R.sup.3 is H or --OH in the case where R.sup.4 is --OH, and is H or --OH or a group of the formula III, ##STR4## in the case where R.sup.4 is a group of the formula II, to a process for obtaining them by fermentation, and to their use as surfactants.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: June 16, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Dieter Wullbrandt, Carlo Giani, Andreas Brakemeier, Siegmund Lang, Fritz Wagner
  • Patent number: 4720456
    Abstract: Anionic, surface-active trehalose lipids, in which different organic acids are bound to a trehalose molecule by an ester linkage, are prepared by aerobically cultivating trehalose-producing microorganisms, capable of assimilating hydrocarbons, under growth-limiting conditions, but without limiting the oxygen.
    Type: Grant
    Filed: August 20, 1986
    Date of Patent: January 19, 1988
    Assignee: Wintershall AG
    Inventors: Fritz Wagner, Egbert Ristau, Zu-yi Li, Siegmund Lang, Walther Schulz, Hans-Jurgen Hofmann, Kai-Udo Sewe, Walter Lindorfer