Granted Patent
Utility
US 5,796,838 · App. 08/691,600
Method and apparatus for performing frequency spectrum inversion
Inventor:
Douglas A. Heerman
Patented Case
View Patent ↗
Granted: Aug 18, 1998
Filed: Aug 2, 1996
Inventor
Douglas A. Heerman
Assignee (at issue)
Transcrypt International, 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.