Granted Patent
Utility
US 6,192,254 · App. 07/843,685
Personal portable apparatus for use in completing a telephone call
Inventors:
Ralph Carlsen, Marc Kaplan, John S. Robertson
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Feb 28, 1992
Inventors
Ralph Carlsen
Marc Kaplan
John S. Robertson
Assignee (at issue)
AT&T CORP.
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.