Granted Patent
Utility
US 4,808,376 · App. 07/083,822
Method of alloying aluminum and calcium into lead
Inventors:
Anthony W. Worcester, Kai Ravnborg, Carlos E. Aguirre
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Aug 10, 1987
Inventors
Anthony W. Worcester
Kai Ravnborg
Carlos E. Aguirre
Assignee (at issue)
The Doe Run Company
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.