Granted Patent
Utility
US 4,649,025 · App. 06/776,311
Anti-corrosion composition
Inventors:
Chih M. Hwa, Wayne A. Mitchell
Patented Case
View Patent ↗
Granted: Mar 10, 1987
Filed: Sep 16, 1985
Inventors
Chih M. Hwa
Wayne A. Mitchell
Assignee (at issue)
W. R. Grace & Co.
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.