Granted Patent
Utility
US 4,915,728 · App. 07/252,100
Iron/cobalt alloy filaments
Inventor:
Thomas SCHELL
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Oct 3, 1988
Inventor
Thomas SCHELL
Assignee (at issue)
GAF Chemicals 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.