Granted Patent
Utility
US 4,813,486 · App. 07/100,303
Retractable slip assembly
Inventors:
Mark L. Wyatt, Andrew J. Tucker
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Sep 23, 1987
Inventors
Mark L. Wyatt
Andrew J. Tucker
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.