Granted Patent
Utility
US 6,517,239 · App. 09/302,479
Time-temperature indicators activated with thermal transfer printing and methods for their production
Inventors:
Joseph D. Roth, John C. Rosenbaum
Patented Case
View Patent ↗
Granted: Feb 11, 2003
Filed: Apr 30, 1999
Inventors
Joseph D. Roth
John C. Rosenbaum
Assignee (at issue)
NCR 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.