Granted Patent
Utility
US 4,970,026 · App. 07/247,136
Corrosion inhibitor
Inventors:
Michael A. Mullins, Robert W. Mueller, Peter A. Thomas
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Sep 21, 1988
Inventors
Michael A. Mullins
Robert W. Mueller
Peter A. Thomas
Assignee (at issue)
Drew Chemical Corporation
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.