Granted Patent
Utility
US 6,550,476 · App. 09/082,665
Heat-moisture exchanger and nebulization device
Inventor:
Steven L. Ryder
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: May 21, 1998
Inventor
Steven L. Ryder
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.