Patents by Inventor Aftab D. Lakdawalla

Aftab D. Lakdawalla 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: 4900727
    Abstract: The present invention relates to novel 4H-1-benzopyran-4-one derivatives, to processes for the preparation thereof and to their use as anti-inflammatory, analgesic, immuno-suppressive and anti-allergic agents. In particular, the present invention relates to novel compounds of the formula I, ##STR1## in which R.sub.1 is hydrogen, alkyl having 1 to 6 carbon atoms, arly-C.sub.1 -C.sub.4 -alkyl, substituted C.sub.1 -C.sub.6 -alkyl, C.sub.3 -C.sub.6 -cycloalkyl, C.sub.3 -C.sub.6 -cycloalkyl-C.sub.1 -C.sub.4 -alkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.3 -C.sub.6 -alkynyl, aryl or carboxyl or an aldehyde or COO--C.sub.1 -C.sub.4 -alkyl group, R.sub.2 is hydrogen, alkyl having 1 to 6 carbon atoms, nitro, amino, di-C.sub.1 -C.sub.4 -alkylamino or a halogen, R.sub.3 is C.sub.1 -C.sub.4 -alkyl, substituted C.sub.1 -C.sub.4 -alkyl, hydroxyl, C.sub.1 -C.sub.4 -alkoxy, aryl-C.sub.1 -C.sub.4 -alkyl, nitro, amino, a C.sub.1 -C.sub.4 -alkylamino or di-C.sub.1 -C.sub.4 -alkylamino group or halogen, R.sub.
    Type: Grant
    Filed: January 26, 1989
    Date of Patent: February 13, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Samba L. Kattige, Ramchandra G. Naik, Aftab D. Lakdawalla, Alihussein N. Dohadwalla, Richard H. Rupp, Noel J. de Souza