Granted Patent
Utility
US 6,539,870 · App. 09/717,271
Blasting method for reducing nitrogen oxide fumes
Inventor:
Richard H. Granholm
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Nov 22, 2000
Inventor
Richard H. Granholm
Assignee (at issue)
Dyno Nobel 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.