Granted Patent
Utility
US 4,915,872 · App. 07/333,872
Cast solid block corrosion inhibitor composition
Inventors:
Stanlay J. Ciuba, Guillermo C. Etienne
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Apr 3, 1989
Inventors
Stanlay J. Ciuba
Guillermo C. Etienne
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.