Granted Patent
Utility
US 6,523,622 · App. 09/674,968
Pneumatic percussion power tool with pneumatic returning spring
Inventors:
Rudolf Berger, Wolfgang Schmid
Patented Case
View Patent ↗
Granted: Feb 25, 2003
Filed: Nov 7, 2000
Inventors
Rudolf Berger
Wolfgang Schmid
Assignee (at issue)
Wacker Construction Equipment AG
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.