Granted Patent
Utility
US 6,386,214 · App. 09/433,881
Umbrella operating system
Inventor:
Dougan H. Clarke
Patented Case
View Patent ↗
Granted: May 14, 2002
Filed: Nov 4, 1999
Inventor
Dougan H. Clarke
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.