Granted Patent
Utility
US 5,201,583 · App. 07/851,499
Temperature history indicator
Inventors:
Joseph Ki Leuk Lai, Brian J. Duggan
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Mar 16, 1992
Inventors
Joseph Ki Leuk Lai
Brian J. Duggan
Assignee (at issue)
British Technology Group Limited
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.