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, 1977
Filed:
Feb. 21, 1975
Applicant:
Inventors:
Hirohiko Shimizu, Kamakura, JA;
Hitoshi Ozawa, Kamakura, JA;
Assignee:
Toray Industries, Inc., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; C08L / ;
U.S. Cl.
CPC ...
252316 ; 106186 ; 106194 ; 536 18 ; 536 22 ;
Abstract
A novel and stable hydrogel contains a water-soluble polymer containing a chelating agent bound to the polymer chain, and a polyvalent metal ion cross-linking the polymer molecules through the chelating agent. The hydrogel is a carrier for timed release of drugs and medicaments.