Granted Patent
Utility
US 3,953,244 · App. 05/582,119
Method of fabricating stable wrought lead-calcium-tin alloys by means of cold working
Inventor:
Raymond D. Prengaman
Patented Case
View Patent ↗
Granted: Apr 27, 1976
Filed: May 30, 1975
Inventor
Raymond D. Prengaman
Assignee (at issue)
St. Joe Minerals 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.