Granted Patent
Utility
US 4,577,685 · App. 06/645,982
Nipple protector sleeve for use in a well conduit
Inventor:
William D. Eatwell
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Aug 31, 1984
Inventor
William D. Eatwell
Assignee (at issue)
Camco 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.