Granted Patent
Utility
US 4,361,545 · App. 06/258,133
Solid pharmaceutical formulations for slow, zero order release via controlled surface erosion
Inventors:
David R. Powell, Vithal K. Patel
Patented Case
View Patent ↗
Granted: Nov 30, 1982
Filed: Apr 27, 1981
Inventors
David R. Powell
Vithal K. Patel
Assignee (at issue)
Rowell Laboratories
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.