Granted Patent
Utility
US 5,444,704 · App. 07/743,661
Dial restoral method and apparatus
Inventors:
P. Michael Henderson, Edward Thoenes
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: Aug 12, 1991
Inventors
P. Michael Henderson
Edward Thoenes
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.