Granted Patent
Utility
US 6,720,922 · App. 10/112,217
Radio-frequency badge for location measurement
Inventors:
Lyndsay Williams, Roger M. Needham
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Mar 29, 2002
Inventors
Lyndsay Williams
Roger M. Needham
Assignee (at issue)
Microsoft Corporation
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.