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. 23, 1999
Filed:
Apr. 30, 1993
Applicant:
Inventors:
Tsung-Min Hsu, Union City, CA (US);
Tung Fen Chen, Sunnyvale, CA (US);
Assignee:
Cygnus, Inc., Redwood City, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
A61F / ; A61F / ; A61F / ;
U.S. Cl.
CPC ...
424449 ; 424484 ; 424447 ; 424448 ;
Abstract
A two-phase hydrophilic drug-containing matrix for use in transdermal drug delivery patches in which one phase is a continuous hydrophobic polymer phase which optionally includes a hydrophobic solvent that acts as a skin permeation enhancer and the other phase is a dispersed particulate hydrated inorganic silicate in whose absorbed aqueous phase the drug is dissolved.