Granted Patent
Utility
US 4,806,448 · App. 07/125,668
Cyclic acetals or ketals of 8-keto esters or amides
Inventor:
Martin Roth
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Nov 27, 1987
Inventor
Martin Roth
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.