Granted Patent
Utility
US 4,320,992 · App. 06/144,712
Grout distribution system
Inventors:
Morris G. Baldridge, Lloyd C. Knox, Bob L. Sullaway
Patented Case
View Patent ↗
Granted: Mar 23, 1982
Filed: Apr 28, 1980
Inventors
Morris G. Baldridge
Lloyd C. Knox
Bob L. Sullaway
Assignee (at issue)
Halliburton
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.