Granted Patent
Utility
US 4,612,073 · App. 06/637,174
Aluminum grain refiner containing duplex crystals
Inventors:
Matthew M. Guzowski, David A. Sentner, Geoffrey K. Sigworth
Patented Case
View Patent ↗
Granted: Sep 16, 1986
Filed: Aug 2, 1984
Inventors
Matthew M. Guzowski
David A. Sentner
Geoffrey K. Sigworth
Assignee (at issue)
Cabot 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.