Granted Patent
Utility
US 6,652,680 · App. 10/092,443
Method for producing tubes for heavy guns
Inventors:
Walter Grimm, Wolfgang Arrenbrecht
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Mar 8, 2002
Inventors
Walter Grimm
Wolfgang Arrenbrecht
Assignees (at issue)
Edelstahlwerke Buderus AG
Rheinmetall W & M GmbH
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.