Granted Patent
Utility
US 6,715,486 · App. 09/773,261
Dry powder inhaler
Inventors:
Andrew W. Gieschen, Michael Ligotke, Jeffrey Chen, Charles F. Ganem, Bernard Greenspan
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Jan 31, 2001
Inventors
Andrew W. Gieschen
Michael Ligotke
Jeffrey Chen
Charles F. Ganem
Bernard Greenspan
Assignee (at issue)
Quadrant Technologies Limited
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.