Granted Patent
Utility
US 6,544,252 · App. 09/472,600
Osmotic delivery system having space efficient piston
Inventors:
Felix Theeuwes, Ben Eckenhoff
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Dec 27, 1999
Inventors
Felix Theeuwes
Ben Eckenhoff
Assignee (at issue)
ALZA CORPORATION
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.