Granted Patent
Utility
US 4,248,723 · App. 05/915,624
Acetal derivatives as extreme pressure additives for lubricants
Inventor:
Andreas Schmidt
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Jun 14, 1978
Inventor
Andreas Schmidt
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.