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:
May. 17, 1983
Filed:
Mar. 23, 1982
Applicant:
Inventor:
William H Daly, Baton Rouge, LA (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08B / ; C08B / ;
U.S. Cl.
CPC ...
536101 ; 536 57 ; 536 84 ; 536102 ; 536114 ; 536121 ;
Abstract
Improved basic polysaccharides are prepared by contacting a polysaccharide with a tetravalent onium salt such as tetramethylammonium chloride prior to contacting it with a strong base such as sodium hydroxide. Polysaccharide derivatives having a greater degree and uniformity of substitution are prepared from such improved basic polysaccharides.