Granted Patent
Utility
US 6,658,671 · App. 10/168,324
Protective helmet
Inventors:
Hans Von Holst, Peter Halldin
Patented Case
View Patent ↗
Granted: Dec 9, 2003
Filed: Jun 20, 2002
Inventors
Hans Von Holst
Peter Halldin
Assignee (at issue)
Neuroprevention Scandinavia 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.