Granted Patent
Utility
US 5,220,593 · App. 07/861,023
Cellular radiotelephone credit card paystation method
Inventors:
Robert G. Zicker, Thanh H. Cao, Daniel Borkowski, Donald A. Plouff, Phillip Brown
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Mar 31, 1992
Inventors
Robert G. Zicker
Thanh H. Cao
Daniel Borkowski
Donald A. Plouff
Phillip Brown
Assignee (at issue)
GTE Mobile Communications Service 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.