Fixed optical attenuator
CA 1185469 A · Owner: Nortel Networks Limited · Inventors: Straus, Jozef; Garel-Jones, Philip M.; Sinclair, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A fixed optical attenuator consists of two optical fibers, the end face of one fiber coated with a light attenuating film abutting the end face of the other fiber and adhering to it. In one, embodiment the film is vacuum-deposited chromium. The attenuator is far more easily fabricated than are known fixed attenuation devices. It is also less mode selective. - i -
Read the whole patent
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
- Granted April 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 2002.
- 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
Timeline From CIPO dates
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.