Granted Patent
Utility
US 4,900,426 · App. 07/332,649
Triphenylphosphine oxide as an ethylene furnace antifoulant
Inventor:
John C. Kisalus
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Apr 3, 1989
Inventor
John C. Kisalus
Assignee (at issue)
Nalco Chemical Company
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.