Granted Patent
Utility
US 5,277,721 · App. 07/880,831
Method for making microporous marking structures
Inventor:
Willem Ooms
Patented Case
View Patent ↗
Granted: Jan 11, 1994
Filed: May 11, 1992
Inventor
Willem Ooms
Assignee (at issue)
Ormecon GmbH
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.