Granted Patent
Utility
US 4,121,927 · App. 05/651,554
Method of producing high carbon hard alloys
Inventors:
Gordon Russell Lohman, James E. Hansen
Patented Case
View Patent ↗
Granted: Oct 24, 1978
Filed: Jan 22, 1976
Inventors
Gordon Russell Lohman
James E. Hansen
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.