Granted Patent
Utility
US 5,622,099 · App. 08/681,985
Brewing head of an espresso maker
Inventor:
Hans Frei
Patented Case
View Patent ↗
Granted: Apr 22, 1997
Filed: Jul 30, 1996
Inventor
Hans Frei
Assignee (at issue)
EUGSTER / FRISMAG 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.