Granted Patent
Utility
US 5,992,891 · App. 09/054,750
Tamper resistant identification card
Inventor:
Christopher J. Dyball
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: Apr 3, 1998
Inventor
Christopher J. Dyball
Assignee (at issue)
Drexler Technology 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.