Granted Patent
Utility
US 4,584,108 · App. 06/563,776
Dispersible alpha alumina monohydrate having increased viscosifying properties
Inventor:
Jacob Block
Patented Case
View Patent ↗
Granted: Apr 22, 1986
Filed: Dec 21, 1983
Inventor
Jacob Block
Assignee (at issue)
W. R. Grace & Co.
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.