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:
Dec. 31, 1991
Filed:
May. 31, 1990
John C Tang, Livingston, NJ (US);
David Naveh, AG Leiden, NL;
Tattanahali L Nagabhushan, Parsippany, NJ (US);
Schering Corporation, Kenilworth, NJ (US);
Abstract
Active recombinant human IL-4 is purified from a crude fermentation broth of a secreted E. coli mutant by subjecting said solution to selective chromatogrphy on a zinc-chelating agarose column at pH 7.2 in a buffer containing a high concentration of sodium chloride, i.e., about 1M sodium chloride, washing first with a phosphate buffer at pH 7.2 containing 1.0M sodium chloride then with a buffer containing 10% glycerol and eluting at pH 5.0. The resulting purified active recombinant human IL-4 solution is further treated by cation exchange chromatography, concentration by diafiltration up to 20 mg/mL and size exclusion gel chromatography using a citrate buffer at pH 4.5.