Patents by Inventor Kenneth T. Porter

Kenneth T. Porter 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 for making quinoline carboxylic acids or naphthyridine carboxylic acids in free base form
    Patent number: 5602254
    Abstract: The present invention provides a method of making quinolone carboxylic acids or naphthyridine carboxylic acids in free base form, the method comprising dissolving a quinolone carboxylic acid salt or naphthyridine carboxylic acid salt in a solvent system to form a solution; combining the solution containing the quinolone carboxylic acid salt or naphthyridine carboxylic acid salt with a calcium salt in an amount in the range of about 0.01% to about 5.0% by weight of the quinolone carboxylic acid salt or naphthyridine carboxylic acid salt and a base, the combination resulting in the formation of a precipitate; and collecting the precipitate. Also provided is a solid bulk pharmaceutical chemical composition which is the product resulting from the precipitation.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: February 11, 1997
    Assignee: Warner-Lambert Company
    Inventors: Gary J. Dozeman, Kenneth T. Porter, James N. Wemple