Granted Patent
Utility
US 5,531,270 · App. 08/435,784
Downhole flow control in multiple wells
Inventors:
Paul Fletcher, Gregory S. Walz
Patented Case
View Patent ↗
Granted: Jul 2, 1996
Filed: May 4, 1995
Inventors
Paul Fletcher
Gregory S. Walz
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.