Granted Patent
Utility
US 5,226,946 · App. 07/890,965
Vacuum melting/casting method to reduce inclusions
Inventors:
Randall S. Diehm, Robert N. Weerstra, Blake K. Zuidema
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: May 29, 1992
Inventors
Randall S. Diehm
Robert N. Weerstra
Blake K. Zuidema
Assignee (at issue)
HOWMET 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.