Granted Patent
Utility
US 4,251,230 · App. 05/955,065
Coal suspensions in organic liquids
Inventor:
Edgar W. Sawyer, Jr.
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Oct 26, 1978
Inventor
Edgar W. Sawyer, Jr.
Assignee (at issue)
International Telephone and Telegraph 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.