Granted Patent
Utility
US 4,212,633 · App. 05/961,298
Vacuum electric furnace
Inventors:
Benjamin A. Kreider, William J. Metalsky
Patented Case
View Patent ↗
Granted: Jul 15, 1980
Filed: Nov 16, 1978
Inventors
Benjamin A. Kreider
William J. Metalsky
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.