Granted Patent
Utility
US 6,554,698 · App. 09/730,211
Fan one way air valve
Inventors:
Sorin Kranzdorf, Lan Tang
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Dec 5, 2000
Inventors
Sorin Kranzdorf
Lan Tang
Assignee (at issue)
Marconi Communications GmbH
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.