Granted Patent
Utility
US 5,651,721 · App. 08/299,558
Method for the precision working of gears with an internally toothed tool, which for dressing remains in the precision working machine
Inventor:
Herbert Schriefer
Patented Case
View Patent ↗
Granted: Jul 29, 1997
Filed: Sep 1, 1994
Inventor
Herbert Schriefer
Assignee (at issue)
THE GLEASON WORKS
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.