Patents by Inventor Mashkoor Husain

Mashkoor Husain 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).

  • Process for the manufacture of 7-amino-3-exomethylene-3-cepham-4-carboxylic acid ester
    Patent number: 5159071
    Abstract: A one-pot process for preparing 7-amino-3-exomethylene-3-cepham-4-carboxylic acid ester (II) comprises: (a) reacting 7-acylamino-3-exomethylene-3-cepham-1-oxide-4-carboxylic acid ester (I) with a silylating agent in an inert solvent and in the presence of a base, (b) adding a phosphorous halide to produce an iminohalide, and (c) adding an anhydrous alcohol. In a preferred embodiment, the silylating agent comprises trimethylchlorosilane, and the phosphorous halide comprises phosphorous pentachloride.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: October 27, 1992
    Assignee: Ranbaxy Laboratories Limited
    Inventors: Jag M. Khanna, Yatendra Kumar, Mashkoor Husain