Granted Patent
Utility
US 4,880,771 · App. 07/160,799
Bismuth-lead-strontium-calcium-cuprate superconductors
Inventors:
Robert J. Cava, Steven A. Sunshine
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Feb 26, 1988
Inventors
Robert J. Cava
Steven A. Sunshine
Assignee (at issue)
American Telephone and Telegraph Company, AT&T Bell Laboratories
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.