Granted Patent
Utility
US 6,758,639 · App. 10/072,322
Bit for cutting drywall
Inventor:
Carl Risen
Patented Case
View Patent ↗
Granted: Jul 6, 2004
Filed: Feb 7, 2002
Inventor
Carl Risen
Assignee (at issue)
Credo Technology Group Limited
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.