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:
Aug. 09, 1983
Filed:
Dec. 29, 1980
Applicant:
Inventors:
Marvin L Oftedahl, Warson Woods, MO (US);
Howard M Solomon, Ballwin, MO (US);
James A Webster, Dayton, OH (US);
Assignee:
Monsanto Company, St. Louis, MO (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; A61K / ;
U.S. Cl.
CPC ...
525374 ; 524378 ; 5253274 ;
Abstract
An improved pharmaceutically active derivative of a copolymer of olefin monomer and .alpha.,.beta.-unsaturated polycarboxylic anhydride is prepared by reacting the copolymer with aqueous ammonia, spray drying the resulting aqueous solution of half-amide, half-ammonium salt and thermally imidating the resulting substantially dry, solid particulate product by simultaneous treatment with elevated temperature and removal of water until 5-40% of the derivative half-amide, half-ammonium salt groups are converted to imide groups.