Granted Patent
Utility
US 5,118,839 · App. 07/576,850
Nitro-substituted polyarylketones
Inventors:
Allan A. Eisenbraun, Venkataraman Ramachandran
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Sep 4, 1990
Inventors
Allan A. Eisenbraun
Venkataraman Ramachandran
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.