Patents by Inventor Istvan Szekely

Istvan Szekely 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).

  • Novel 17-aza-PGF.sub.2.alpha. derivatives and pharmaceutical compositions containing the same
    Patent number: 4191774
    Abstract: N-Acylated 17-Aza-PGF.sub.2.alpha. compounds have been prepared.
    Type: Grant
    Filed: January 18, 1978
    Date of Patent: March 4, 1980
    Assignee: Chinoin Gyogyszer es Vegyeszeti Termekek Gyara R.T.
    Inventors: Istvan Szekely, Gabor Kovacs, Sandor Virag, Matyas Szentivanyi
  • Process for the preparation of bicyclic enone compounds
    Patent number: 4176122
    Abstract: A process for the preparation of bicyclic enon compounds in which a lactone diol is selectively oxidized to obtain a hydroxy-aldehyde with one hydroxyl group and, without isolation, the hydroxy-aldehyde is reacted with a phosphorus compound. The reaction product can be acylated or silylated.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: November 27, 1979
    Assignee: Chinoin Gyogyszer es Vegyeszeti Termekek
    Inventors: Istvan Szekely, Istvan Tomoskozi, Gabor Kovacs, Vilmos Simonidesz, Marianna Lovasz nee Gaspar, Borbala nee Ordog Keresztes, Julia nee Radoczi Remport, Istvan Stadler, Zsuzsa nee Gombos Visky, Csaba Szantay
  • Bicyclic lactone derivatives employed as intermediates in the synthesis of prostaglandines
    Patent number: 4126622
    Abstract: A compound of the formula is disclosed. ##STR1## wherein R.sup.3 and R.sup.4 are the same or different and are each hydrogen, lower alkanoyl, lower alkanoyl substituted by 1, 2, or 3 halogen atoms, or R.sup.3 and R.sup.4 together form an ##STR2## group in which R.sup.5 and R.sup.6 are the same or different and are each hydrogen, alkyl or aryl as well as a process for the preparation thereof.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: November 21, 1978
    Assignee: Chinoin Gyogyszer es Vegyeszeti Termekek Gyara RT
    Inventors: Istvan Tomoskozi, Gabor Kovacs, Istvan Szekely, Vilmos Simonidesz, Marianna Lovasz nee Gaspar, Borbala Keresztes nee Ordog, Julia Remport nee Radoczi, Istvan Stadler, Zsuzsa Visky nee Gombos, Csaba Szantay
  • Process for the nitration of anthraquinones
    Patent number: 3968130
    Abstract: The invention relates to a process for the manufacture of anthraquinones which are mononitrated in the .alpha.-position, especially 1-nitroanthraquinone, wherein an anthraquinone which possesses at least 1 free .alpha.-position and is optionally substituted in the other .alpha.-position with halogen, preferably chlorine, or with hydroxyl groups, but especially the unsubstituted anthraquinone, is nitrated with concentrated nitric acid without further additives adiabatically, or at temperature above 40.degree.C isothermically, and optionally under pressure.
    Type: Grant
    Filed: October 25, 1972
    Date of Patent: July 6, 1976
    Assignee: Ciba-Geigy AG
    Inventor: Istvan Szekely