Granted Patent
Utility
US 4,755,276 · App. 06/936,733
Nitro-substituted pitch and process for the production thereof
Inventor:
Irwin C. Lewis
Patented Case
View Patent ↗
Granted: Jul 5, 1988
Filed: Nov 17, 1986
Inventor
Irwin C. Lewis
Assignee (at issue)
Union Carbide 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.