Granted Patent
Utility
US 4,558,137 · App. 06/501,309
Bis phenyl (2 carboxylic acid or ester indol-3-yl)methanes
Inventors:
Paul Schmidt, William M. Hung
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Jun 6, 1983
Inventors
Paul Schmidt
William M. Hung
Assignee (at issue)
Hilton Davis Chemical Co.
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.