Granted Patent
Utility
US 6,116,237 · App. 08/847,287
Methods of dry powder inhalation
Inventors:
Robert K. Schultz, Clyde L. Witham, Malcolm Hill
Patented Case
View Patent ↗
Granted: Sep 12, 2000
Filed: Apr 24, 1997
Inventors
Robert K. Schultz
Clyde L. Witham
Malcolm Hill
Assignee (at issue)
Dura Pharmaceuticals, Icn.
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.