Granted Patent
Utility
US 4,492,614 · App. 06/512,298
Chlorine detection
Inventor:
Lawrence B. Welsh
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Jul 8, 1983
Inventor
Lawrence B. Welsh
Assignee (at issue)
UOP 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.