Granted Patent
Utility
US 5,177,257 · App. 07/776,385
Benzocycloalkenecarboxylic acid and process for its preparation
Inventors:
Andreas von Sprecher, Hansjurg Wetter
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Nov 20, 1991
Inventors
Andreas von Sprecher
Hansjurg Wetter
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.