Granted Patent
Utility
US 4,930,573 · App. 07/334,720
Dual hydraulic set packer
Inventors:
Andrew R. Lane, Richard M. Sproul
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Apr 6, 1989
Inventors
Andrew R. Lane
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.