Granted Patent
Utility
US 4,492,590 · App. 06/447,315
Stabilizers for oil slurries of carbonaceous material
Inventors:
Martin J. Schick, Edwin L. Kelley
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Dec 6, 1982
Inventors
Martin J. Schick
Edwin L. Kelley
Assignee (at issue)
Diamond Shamrock Chemicals 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.