Granted Patent
Utility
US 4,243,298 · App. 05/949,351
High-strength optical preforms and fibers with thin, high-compression outer layers
Inventors:
Charles K. Kao, Mokhtar S. Maklad
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Oct 6, 1978
Inventors
Charles K. Kao
Mokhtar S. Maklad
Assignee (at issue)
International Telephone and Telegraph 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.