Granted Patent
Utility
US 6,227,692 · App. 08/909,716
Double wave screw
Inventor:
William R. Heathe
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Aug 12, 1997
Inventor
William R. Heathe
Assignee (at issue)
Husky Injection Molding Systems Ltd.
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.