Granted Patent
Utility
US 6,623,228 · App. 09/830,274
Thread-cutting screw
Inventors:
Ulrich Hettich, Stefan Hettich
Patented Case
View Patent ↗
Granted: Sep 23, 2003
Filed: Aug 13, 2001
Inventors
Ulrich Hettich
Stefan Hettich
Assignee (at issue)
Ludwig Hettich & Co.
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.