Granted Patent
Utility
US 4,556,097 · App. 06/625,085
Mold plug and method for sealing an ingot mold
Inventor:
Kevin L. Burmeister
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: Jun 27, 1984
Inventor
Kevin L. Burmeister
Assignee (at issue)
Graphite Sales, 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.