Granted Patent
Utility
US 6,587,553 · App. 09/211,994
Method and apparatus for protecting call privacy
Inventors:
Shmuel Shaffer, William J. Beyda
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Dec 14, 1998
Inventors
Shmuel Shaffer
William J. Beyda
Assignee (at issue)
Siemens Information and Communication Networks, 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.