Granted Patent
Utility
US 5,988,313 · App. 08/989,007
Earplug
Inventor:
Jorgen Hakansson
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Dec 11, 1997
Inventor
Jorgen Hakansson
Assignee (at issue)
Dalloz Safety 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.