Granted Patent
Utility
US 6,688,148 · App. 10/056,628
Manufacturing process for making engine components of high carbon content steel using cold forming techniques
Inventors:
Raymond C. Hartzell, Jeffrey A. Buck, Stanley Marchewka
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Jan 25, 2002
Inventors
Raymond C. Hartzell
Jeffrey A. Buck
Stanley Marchewka
Assignee (at issue)
Defiance Precision Products, Inc.
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.