Granted Patent
Utility
US 4,380,588 · App. 06/340,057
Glass for infrared ray-transmitting optical fibers and optical fibers formed from said glass
Inventors:
Seiko Mitachi, Shuichi Shibata, Terutoshi Kanamori, Toyotaka Manabe, Mitsuho Yasu
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Jan 18, 1982
Inventors
Seiko Mitachi
Shuichi Shibata
Terutoshi Kanamori
Toyotaka Manabe
Mitsuho Yasu
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.