Granted Patent
Utility
US 4,420,441 · App. 06/466,474
Method of making a two-phase or multi-phase metallic material
Inventor:
Alfred R. E. Singer
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Feb 15, 1983
Inventor
Alfred R. E. Singer
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.