Granted Patent
Utility
US 5,086,839 · App. 07/611,188
Well packer
Inventors:
John R. Setterberg, Jr., Pat M. White
Patented Case
View Patent ↗
Granted: Feb 11, 1992
Filed: Nov 8, 1990
Inventors
John R. Setterberg, Jr.
Pat M. White
Assignee (at issue)
Otis Engineering Corporation
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.