Granted Patent
Utility
US 5,398,772 · App. 08/086,525
Impact hammer
Inventor:
Hans E. Edlund
Patented Case
View Patent ↗
Granted: Mar 21, 1995
Filed: Jul 1, 1993
Inventor
Hans E. Edlund
Assignee (at issue)
Reedrill Corporation
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.