Granted Patent
Utility
US 5,329,570 · App. 07/984,802
Copy protection of software for use in a private branch exchange switch
Inventors:
Joseph F. Glassmacher, Joseph M. Greene, Martin R. Kester, Joseph L. LaCava
Patented Case
View Patent ↗
Granted: Jul 12, 1994
Filed: Dec 3, 1992
Inventors
Joseph F. Glassmacher
Joseph M. Greene
Martin R. Kester
Joseph L. LaCava
Assignee (at issue)
AT&T Bell Laboratories
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.