Granted Patent
Utility
US 5,256,729 · App. 08/007,472
Nitrile derivative for sand control
Inventors:
Helmuth W. Kutta, Robin Wiser-Halladay
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Jan 22, 1993
Inventors
Helmuth W. Kutta
Robin Wiser-Halladay
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.