Granted Patent
Utility
US 4,812,290 · App. 06/904,511
Third element additions to aluminum-titanium master alloys
Inventor:
Geoffrey K. Sigworth
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Sep 8, 1986
Inventor
Geoffrey K. Sigworth
Assignee (at issue)
KB Alloys
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.