Granted Patent
Utility
US 5,188,174 · App. 07/679,733
Apparatus for inserting and withdrawing coil tubing into a well
Inventor:
William Anderson
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Apr 3, 1991
Inventor
William Anderson
Assignee (at issue)
Stewart & Stevenson 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.