Granted Patent
Utility
US 4,447,341 · App. 06/412,152
Clay stabilizer composition for aqueous drilling fluids
Inventor:
Jacob Block
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Aug 27, 1982
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.