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. 21, 2006
Filed:
Jun. 19, 2002
Takeshi Nakanishi, Kamagaya, JP;
Kazuhisa Shimizu, Maebashi, JP;
Ryuji Uehara, Takasaki, JP;
Masanobu Suzuki, Saitama, JP;
Takeshi Nakanishi, Kamagaya, JP;
Kazuhisa Shimizu, Maebashi, JP;
Ryuji Uehara, Takasaki, JP;
Masanobu Suzuki, Saitama, JP;
Nippon Kayaku Kabushiki Kaisha, Tokyo, JP;
Other;
Abstract
A process for purification which permits satisfactory removal of impurities from a block copolymer consisting essentially of polyethylene glycols and poly(acidic amino acid) and is suitable for the production of a polymeric carrier having a pharmaceutically acceptable purity; a process for producing such a polymeric carrier; a block copolymer reduced in impurity content; a polymeric carrier as described above; pharmaceutical preparations in polymeric form, produced by the use of the carrier; and a method of subjecting polyethylene glycols and poly(acidic amino acids)—which are impurities contained in the block copolymer—to treatment with either an ion-exchange resin or a partition/absorption resin and then determining the quantities of them with a gel filtration column.