Granted Patent
Utility
US 4,931,327 · App. 07/366,094
White opaque opp film for tamper evident package
Inventors:
Leland L. Liu, Michael T. Heffelfinger, Donald G. Whyman
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Jun 14, 1989
Inventors
Leland L. Liu
Michael T. Heffelfinger
Donald G. Whyman
Assignee (at issue)
Mobil Oil 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.