Granted Patent
Utility
US 4,411,800 · App. 06/257,091
High temperature stable fluid loss control system
Inventors:
Peter C. Green, Jacob Block
Patented Case
View Patent ↗
Granted: Oct 25, 1983
Filed: Apr 24, 1981
Inventors
Peter C. Green
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.