Granted Patent
Utility
US 4,731,826 · App. 06/791,262
Mixed mode dialing system
Inventor:
Hedayat E. Daie
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Oct 25, 1985
Inventor
Hedayat E. Daie
Assignee (at issue)
US
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.