Granted Patent
Utility
US 5,084,623 · App. 07/652,328
Radiation dosage indicator
Inventors:
David F. Lewis, Carl A. Listl
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Feb 7, 1991
Inventors
David F. Lewis
Carl A. Listl
Assignee (at issue)
ISP INVESTMENTS LLC
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.