Granted Patent
Utility
US 6,596,072 · App. 10/100,390
Product and method for coloring concrete
Inventors:
Jack Dunnous, William J. Yocum
Patented Case
View Patent ↗
Granted: Jul 22, 2003
Filed: Mar 18, 2002
Inventors
Jack Dunnous
William J. Yocum
Assignee (at issue)
Hamburger Color Company
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.