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. 29, 1998
Filed:
Oct. 13, 1995
Dan W Urry, Birmingham, AL (US);
David T McPherson, Birmingham, AL (US);
Jie Xu, Birmingham, AL (US);
Bioelastics Research, Ltd., Birmingham, AL (US);
UAB Research Foundation Ltd., Birmingham, AL (US);
Abstract
A method for purifying an artificial polymer that exhibits a reversible inverse temperature transition is provided. The method involves (a) dissolving the polymer in an aqueous medium so that the temperature of the medium is below the effective transition temperature; (b) adjusting the temperature of the aqueous medium relative to the effective transition temperature of the polymer; (c) removing any particulate material from the medium; (d) adjusting the temperature of the aqueous medium relative to the effective transition temperature of the polymer so that the temperature of the medium is above the effective transition temperature; (e) collecting the polymer from the medium as a more dense phase; and (f) optionally repeating any of steps (a)-(e) until a desired level or purity is reached; with the proviso the order of steps can be (a)-(d)-(e)-(a)-(b)-(c).