Granted Patent
Utility
US 6,233,989 · App. 09/687,375
Method and apparatus for stamping a metal sheet with an apertured design having rolled edges
Inventor:
Raymond Z. Blinstrubas
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Oct 13, 2000
Inventor
Raymond Z. Blinstrubas
Assignee (at issue)
Changing Paradigms, LLC
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.