Granted Patent
Utility
US 4,722,367 · App. 07/071,576
Modular vortex spoiler system for pipelines
Inventors:
Marvin N. Swink, Robert B. Schultz, James O. Towery
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Jul 9, 1987
Inventors
Marvin N. Swink
Robert B. Schultz
James O. Towery
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.