Optical functioning glass and apparatus using the same
CA 2060427 C · Owner: Miyajima, Yoshiaki · Inventors: Kanamori, Hiroo; Onishi, Masashi; Miyajima, Yoshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical functioning glass for enabling optical amplification at 1.3-µm wavelength band or increasing efficiency of the amplification is disclosed. The optical functioning glass contains Nd3+ as an active material and uranium, both of which are doped in a multi-component function glass serving as a host glass. Since uranium is doped in the optical functioning glass, light emission of Nd3+ in the 1.06-µm wavelength band can be absorbed by uranium. A decrease in efficiency of induced emission in a 1.3-µm wavelength band can be prevented, and an optical functioning glass suitable for optical amplification in the 1.3-µm wavelength band can be obtained. When a fiber is formed using the optical …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 31, 1992 and granted August 19, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.