Granted Patent
Utility
US 5,114,977 · App. 07/740,657
Ethers
Inventors:
Friedrich Karrer, Alfred Rindlisbacher
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Aug 2, 1991
Inventors
Friedrich Karrer
Alfred Rindlisbacher
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.