Granted Patent
Utility
US 4,530,398 · App. 06/404,386
Retrievable well bore packer
Inventors:
Donald Roy Greenlee, ALBERT E. KLINE
Patented Case
View Patent ↗
Granted: Jul 23, 1985
Filed: Aug 2, 1982
Inventors
Donald Roy Greenlee
ALBERT E. KLINE
Assignee (at issue)
Arrow Oil Tools, 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.