Granted Patent
Utility
US 4,535,199 · App. 06/514,518
Data call transfer preindication
Inventor:
John H. Zink
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Jul 18, 1983
Inventor
John H. Zink
Assignee (at issue)
AT&T Information Systems Inc.
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.