Granted Patent
Utility
US 4,132,630 · App. 05/893,084
Method for separating solids from coal liquids
Inventors:
Norman L. Carr, Edgar L. McGinnis
Patented Case
View Patent ↗
Granted: Jan 2, 1979
Filed: Apr 3, 1978
Inventors
Norman L. Carr
Edgar L. McGinnis
Assignee (at issue)
Gulf Research & Development Company
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.