Granted Patent
Utility
US 6,397,754 · App. 09/424,016
Method and apparatus for charging boreholes with explosives
Inventor:
Hans Perlid
Patented Case
View Patent ↗
Granted: Jun 4, 2002
Filed: Nov 18, 1999
Inventor
Hans Perlid
Assignee (at issue)
Nitro Nobel AB
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.