Optical isolator device capable of preventing optical axis from inclining by deformation of adhesive
CA 2118741 C · Owner: Nec Tokin Corporation · Inventors: Masumoto, Toshiaki; Suzuki, Takayuki; Shibuya, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical isolator device comprised a magnet having a rectangular channel and a rectangular optical isolator element fitted in the channel and fixed to the magnet by adhesive filled up in a gap around the element in the channel, in order to avoid an increased thickness of the adhesive layer which is caused by round corners of the rectangular channel in production of the magnet by the injection molding, the magnet is formed with a small slit outwardly extending from each corner of the rectangular channel. Thus, the element is fitted in the channel without interference of the channel corners and is in close contact with at least one of flat inner surfaces of the channel to form a thin gap …
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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 March 10, 1994 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2016.
- 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.