Granted Patent
Utility
US 5,539,381 · App. 08/337,898
Fixed threshold and rate of rise heat detector with dynamic thermal reference
Inventor:
Kirk R. Johnson
Patented Case
View Patent ↗
Granted: Jul 23, 1996
Filed: Nov 14, 1994
Inventor
Kirk R. Johnson
Assignee (at issue)
Sentrol, Inc.
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.