Granted Patent
Utility
US 5,456,319 · App. 08/282,685
Apparatus and method for blocking well perforations
Inventors:
Joseph H. Schmidt, James C. Abel, Curtis G. Blount, Keith R. Ferguson, Michael J. Bolkovatz
Patented Case
View Patent ↗
Granted: Oct 10, 1995
Filed: Jul 29, 1994
Inventors
Joseph H. Schmidt
James C. Abel
Curtis G. Blount
Keith R. Ferguson
Michael J. Bolkovatz
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.