Granted Patent
Utility
US 4,837,253 · App. 07/132,398
Corrosion inhibiting pigment
Inventors:
J. Douglas Mansell, Laurence E. Jones, Harlan B. Johnson, Thomas G. Krivak, Dennis W. Carson
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Dec 15, 1987
Inventors
J. Douglas Mansell
Laurence E. Jones
Harlan B. Johnson
Thomas G. Krivak
Dennis W. Carson
Assignee (at issue)
PPG Industries, Inc.
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.