Granted Patent
Utility
US 5,768,752 · App. 08/804,080
Puzzle-lock compression ring
Inventor:
Hans Oetiker
Patented Case
View Patent ↗
Granted: Jun 23, 1998
Filed: Feb 21, 1997
Inventor
Hans Oetiker
Assignee (at issue)
Hans Oetiker AG Maschinen-und Apparatefabrik
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.