Granted Patent
Utility
US 4,880,028 · App. 07/305,613
Completion machine
Inventors:
Coy D. Osburn, James B. Sullivan
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Feb 3, 1989
Inventors
Coy D. Osburn
James B. Sullivan
Assignee (at issue)
TDW Delaware, 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.