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:
Jul. 08, 1997
Filed:
Jun. 06, 1995
Nimai C De, Rochester, NY (US);
Anil M Salpekar, Pittsford, NY (US);
Bausch & Lomb Incorporated, Rochester, NY (US);
Abstract
A composition for delaying release of an active component into an aqueous fluid is taught which includes a capsule that swells in the presence of an aqueous fluid allowing moisture to enter the capsule into contact with a capsule decomposing agent activated by the entering moisture such that the agent decomposes the capsule sufficiently to release the active agent at a predetermined delayed time after the capsule contacts the aqueous fluid. A preferred capsule composition is gelatin and decomposing agents are a proteolytic enzyme or a salt that effects the osmotic gradient of the system. The controlled release composition of the invention is preferably utilized in a soft contact lens disinfecting system wherein a solution of hydrogen peroxide disinfects the lenses followed by neutralization of residual hydrogen peroxide wherein release of the neutralizing agent is delayed by means of the capsule proteolytic enzyme or salt composition.