Granted Patent
Utility
US 5,189,645 · App. 07/786,640
Downhole tool
Inventor:
Frank Innes
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Nov 1, 1991
Inventor
Frank Innes
Assignee (at issue)
Halliburton Logging Services, Inc.
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.