Granted Patent
Utility
US 4,374,256 · App. 06/008,943
Process for the preparation of pyrryl-2-acetonitrile
Inventors:
James Kao, Karl E. Wiegand
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Feb 2, 1979
Inventors
James Kao
Karl E. Wiegand
Assignee (at issue)
Ethyl Corporation
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.