Granted Patent
Utility
US 4,599,464 · App. 06/788,731
Novel compositions
Inventor:
Hans Dressler
Patented Case
View Patent ↗
Granted: Jul 8, 1986
Filed: Oct 17, 1985
Inventor
Hans Dressler
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.