Granted Patent
Utility
US 5,900,606 · App. 08/732,507
Method of writing information securely in a portable medium
Inventors:
Vincent Rigal, Thierry Koeberle
Patented Case
View Patent ↗
Granted: May 4, 1999
Filed: Nov 12, 1996
Inventors
Vincent Rigal
Thierry Koeberle
Assignee (at issue)
Schlumberger Industires, S.A.
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.