Granted Patent
Utility
US 6,748,151 · App. 09/868,766
Optical fiber attenuator with attenuating dopant limited to a central or peripheral area of the fiber core
Inventors:
Masaru Watanabe, Eiji Matsuyama, Akiyoshi Naruse, Yuichi Murakami, Kenichi Muta, Toyomitsu Yamamoto
Patented Case
View Patent ↗
Granted: Jun 8, 2004
Filed: Jun 21, 2001
Inventors
Masaru Watanabe
Eiji Matsuyama
Akiyoshi Naruse
Yuichi Murakami
Kenichi Muta
Toyomitsu Yamamoto
Assignee (at issue)
Showa Electric Wire & Cable Co., Ltd.
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.