Granted Patent
Utility
US 5,931,615 · App. 08/832,289
Twist drill bit
Inventor:
Juergen Wiker
Patented Case
View Patent ↗
Granted: Aug 3, 1999
Filed: Apr 3, 1997
Inventor
Juergen Wiker
Assignee (at issue)
Credo Tool Corporation
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.