Granted Patent
Utility
US 6,721,539 · App. 09/700,279
Communications device retroreflecting incident modulated radiation
Inventors:
Dominic O'Brien, David John Edwards, Stephen John Sheard, Grahame Edward Faulkner
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Jan 5, 2001
Inventors
Dominic O'Brien
David John Edwards
Stephen John Sheard
Grahame Edward Faulkner
Assignee (at issue)
Isis Innovation Limited
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.