Granted Patent
Utility
US 5,379,989 · App. 08/111,306
Tundish with improved flow control
Inventors:
Lawrence J. Heaslip, James D. Dorricott
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Aug 24, 1993
Inventors
Lawrence J. Heaslip
James D. Dorricott
Assignee (at issue)
Premier Refractories and Chemicals Inc.
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.