Granted Patent
Utility
US 4,837,539 · App. 07/130,242
Magnetic sensing proximity detector
Inventor:
Gerald S. Baker
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Dec 8, 1987
Inventor
Gerald S. Baker
Assignee (at issue)
Cameron Iron Works USA, 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.