Granted Patent
Utility
US 4,333,209 · App. 06/165,585
Rotary power slips
Inventor:
Neil Herst
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: Jul 3, 1980
Inventor
Neil Herst
Assignee (at issue)
BJ-Hughes 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.