Granted Patent
Utility
US 4,581,147 · App. 06/570,093
Dispersant for water-based solids-containing fluids and a drilling fluid
Inventor:
Homer Branch, III
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Jan 12, 1984
Inventor
Homer Branch, III
Assignee (at issue)
SUN DRILLING PRODUCTS CORPORATION
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.