Granted Patent
Utility
US 5,029,614 · App. 07/326,204
Tandem seal system for testing pipelines
Inventors:
Pedro F. Lara, Steven G. Petermann
Patented Case
View Patent ↗
Granted: Jul 9, 1991
Filed: Mar 20, 1989
Inventors
Pedro F. Lara
Steven G. Petermann
Assignee (at issue)
Atlantic Richfield Company
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.