Granted Patent
Utility
US 4,839,501 · App. 06/904,298
Cartridge soldering iron
Inventor:
Mark J. Cowell
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Sep 8, 1986
Inventor
Mark J. Cowell
Assignee (at issue)
Metcal, 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.