Granted Patent
Utility
US 4,946,589 · App. 07/020,324
High volume permanent magnet filter for removing ferromagnetic impurities
Inventor:
James K. Hayes
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Feb 27, 1987
Inventor
James K. Hayes
Assignee (at issue)
Combustion Engineering, 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.