Granted Patent
Utility
US 5,221,831 · App. 07/798,713
Flap-type portal reader
Inventor:
Theodore D. Geiszler
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Nov 29, 1991
Inventor
Theodore D. Geiszler
Assignee (at issue)
Indala 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.