Granted Patent
Utility
US 4,124,199 · App. 05/814,221
Process and apparatus for case hardening of ferrous metal work pieces
Inventors:
William R. Jones, Prem C. Jindal
Patented Case
View Patent ↗
Granted: Nov 7, 1978
Filed: Jul 11, 1977
Inventors
William R. Jones
Prem C. Jindal
Assignee (at issue)
Abar Corporation
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.