Granted Patent
Utility
US 4,645,780 · App. 06/817,984
Novel biocides employing resorcinol derivatives
Inventors:
Hans Dressler, Hans A. Ward
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Jan 13, 1986
Inventors
Hans Dressler
Hans A. Ward
Assignee (at issue)
KOPPERS, 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.