Granted Patent
Utility
US 4,671,354 · App. 06/770,149
Well packer
Inventors:
William David Henderson, Dhirajlal C. Patel, Dennis D. Rood, Richard M. Sproul
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Aug 27, 1985
Inventors
William David Henderson
Dhirajlal C. Patel
Dennis D. Rood
Richard M. Sproul
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.