04721613 is referenced by 62 patents and cites 4 patents.

A delivery system is disclosed for delivering an agent to a selected environment of use having a pH of greater than 3.5.

Title
Delivery system comprising means for shielding a multiplicity of reservoirs in selected environment of use
Application Number
448956
Publication Number
4721613
Application Date
September 17, 1984
Publication Date
January 26, 1988
Inventor
Felix Theeuwes
Los Altos
CA, US
John Urquhart
Palo Alto
CA, US
Agent
Steven F Stone
Edward L Mandell
Paul L Sabatine
Assignee
ALZA Corporation
CA, US
IPC
A61K 9/26
A61K 9/24
A61K 9/22
A61K 9/00
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