Granted Patent
Utility
US 4,383,117 · App. 06/317,156
Process for producing substituted pyrroles
Inventors:
James Kao, Everett M. Marlett
Patented Case
View Patent ↗
Granted: May 10, 1983
Filed: Nov 2, 1981
Inventors
James Kao
Everett M. Marlett
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.