Granted Patent
Utility
US 4,238,547 · App. 05/965,671
High strength yarn consisting of boron carbide fibers
Inventors:
James Economy, Ruey Y. Lin, William D. Smith
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Dec 1, 1978
Inventors
James Economy
Ruey Y. Lin
William D. Smith
Assignee (at issue)
Carborundum 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.