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:
Nov. 30, 1999
Filed:
Dec. 31, 1997
Applicant:
Inventors:
Kanji Murofushi, Joetsu, JP;
Taira Homma, Joetsu, JP;
Shigehiro Nagura, Niigata-ken, JP;
Richard Armentrout, La Jolla, CA (US);
Assignees:
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Shin-Etsu Bio, Inc., San Diego, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C12N / ; C12N / ; C12P / ;
U.S. Cl.
CPC ...
435104 ; 435183 ; 4352521 ; 435262 ; 435822 ; 435910 ;
Abstract
Xanthan gum is purified by heat-treating a xanthan gum fermented broth, and consecutively treating the broth first with alkaline protease and then with lysozyme or in reverse order, and thereafter recovering xanthan gum from the treated broth. A clear aqueous solution of xanthan gum may be obtained without complex procedures. The xanthan gum is separated and purified and 0.3% aqueous solution of the purified xanthan gum has a transmittance of at least 80%.