The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 1991
Filed:
May. 15, 1989
Carey B Bottom, Overland Park, KS (US);
Margaret N Kwoka, Merriam, KS (US);
Marion Laboratories, Inc., Kansas City, MO (US);
Abstract
An aqueous solution of 5-aminosalicylic acid (5-ASA) and a nontoxic alkali, alkali metal or alkaline earth metal salt of 5-aminosalicylic acid having a pH of 3-5 is disclosed. The sole buffer in the solution is that intrinsically formed by 5-aminosalicylic acid and its alkali, alkali metal or alkaline earth metal salt. The solutions preferably also contain an antioxidant and a metal complexing agent. In preferrred practice, the 5-ASA salt is formed in situ by addition of an alkali, alkali metal or alkaline earth metal hydroxide to a solution of 5-ASA. The solution is stable and does not significantly discolor due to 5-ASA decomposition for extended periods of time.