Granted Patent
Utility
US 4,489,183 · App. 06/561,039
Stabilization of red phosphorus
Inventor:
Helena Twardowska
Patented Case
View Patent ↗
Granted: Dec 18, 1984
Filed: Dec 13, 1983
Inventor
Helena Twardowska
Assignee (at issue)
ERCO Industries Limited
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.