Granted Patent
Utility
US 6,315,504 · App. 09/427,706
Twist Drill
Inventors:
Toru Sekiguchi, Yoshiro Suzuku
Patented Case
View Patent ↗
Granted: Nov 13, 2001
Filed: Oct 27, 1999
Inventors
Toru Sekiguchi
Yoshiro Suzuku
Assignee (at issue)
NACHI-FUJIKOSHI CORP.
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.