Granted Patent
Utility
US 4,496,940 · App. 06/339,686
Sensing and indicator system for detecting heating element failures
Inventor:
Conrad J. Christel
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Jan 15, 1982
Inventor
Conrad J. Christel
Assignee (at issue)
Pall 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.