Granted Patent
Utility
US 4,264,573 · App. 06/040,789
Pharmaceutical formulation for slow release via controlled surface erosion
Inventors:
David R. Powell, Vithal K. Patel
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: May 21, 1979
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.