Granted Patent
Utility
US 4,872,960 · App. 07/219,695
Protective coatings of a cured hydroxystyrene mannich base and blocked polyisocyantes
Inventors:
Donna L. Keene, Darrell D. Hicks
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: Jul 18, 1988
Inventors
Donna L. Keene
Darrell D. Hicks
Assignee (at issue)
Hoechst Celanese 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.