Granted Patent
Utility
US 5,148,481 · App. 07/723,875
Transaction system security method and apparatus
Inventors:
Dennis G. Abraham, Steven G. Aden, Todd W. Arnold, Steven W. Neckyfarow, William S. Rohland
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Jul 1, 1991
Inventors
Dennis G. Abraham
Steven G. Aden
Todd W. Arnold
Steven W. Neckyfarow
William S. Rohland
Assignee (at issue)
International Business Machines 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.