Granted Patent
Utility
US 5,203,396 · App. 07/874,629
Vacuum valve for die casting
Inventors:
Russell J. VanRens, James M. Rumford, Thornton E. Schultz
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Apr 27, 1992
Inventors
Russell J. VanRens
James M. Rumford
Thornton E. Schultz
Assignee (at issue)
Outboard Marine 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.