Granted Patent
Utility
US 6,442,571 · App. 09/694,472
Methods and apparatus for secure electronic, certified, restricted delivery mail systems
Inventors:
Maurice Haff, Christopher D. Clarke
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Oct 24, 2000
Inventors
Maurice Haff
Christopher D. Clarke
Assignee (at issue)
Hyperspace Communications, Inc.
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.