Granted Patent
Utility
US 5,057,434 · App. 07/400,308
Multifunctional time-temperature indicator
Inventors:
Thaddeus Prusik, Raymond M. Arnold
Patented Case
View Patent ↗
Granted: Oct 15, 1991
Filed: Aug 29, 1989
Inventors
Thaddeus Prusik
Raymond M. Arnold
Assignee (at issue)
LifeLines Technology, Inc.
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.