Granted Patent
Utility
US 4,376,054 · App. 06/311,690
1,3,2-Dioxaphospholanes as lubricant additives and lubricants containing same
Inventor:
Horst Zinke
Patented Case
View Patent ↗
Granted: Mar 8, 1983
Filed: Oct 15, 1981
Inventor
Horst Zinke
Assignee (at issue)
Ciba-Geigy
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.