Granted Patent
Utility
US 4,492,589 · App. 06/419,753
Anionic dispersants for aqueous slurries of carbonaceous materials
Inventors:
Martin J. Schick, Edwin L. Kelley
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Sep 20, 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.