Granted Patent
Utility
US 4,658,886 · App. 06/774,998
High temperature molds and composition for same
Inventors:
Walter H. Carlson, Kevin L. Burmeister
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Sep 11, 1985
Inventors
Walter H. Carlson
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.